Making your mind up too quickly!

My last full-time job was managing a residential activity centre for a large female-only charity in the UK. The property consisted of a 12 bed-roomed house with around 40 beds (an old Rectory), 6 campsites (4 of which had direct access to showers and toilets), and a variety of adventurous activities.
Our focus, obviously, had to be the members of the organisation, but we allowed others to use the facilities at times that didn't clash with the charity's needs, so term-time weekdays we had schools camping and using the activities as they were not needed by the members, and similarly the house could be booked during the week for schools, business conferences, or even residential stays (occasionally by groups of "retired" or senior members).
Weekends were generally reserved for the association, as were the campsites during the school holidays. We were, however, always open to new ideas to generate income for the charity, and offset the considerable running costs. Weekday business conferences were one of the services we offered, as well as training days (using our adventurous activities), but the take-up was relatively poor.
One day one of my assistants came in and said "Why don't we do weddings? A lot of country houses like this do and we could charge a lot of money for the facility." I may have been a little hasty at pouring cold water on the idea, but listed my "objections":
1. Most weddings are weekends, and this is core time for our members
2. Weddings tend to be noisy and we already have a poor reputation with some of our neighbours
3. Parking will be an issue - we only have parking for around 20 vehicles as it stands
4. We would probably have to close the entire site for the duration of the wedding - as we could hardly have revellers wandering around the estate and into campsites occupied by young female members
5. A Saturday wedding (well, any day of the week wedding) would probably require the previous day for preparing and decorating the venue, and the following day for clearing and cleaning - so we would be looking at a 3 day booking for the wedding.
6. Staffing would be expensive as we do not currently have the staff required to attend a wedding
The other 2 assistantss looked at me as I listed all this - they had not considered any of these factors, simply that weddings bring in money! A counter suggestion was made that we "sell" it as venue only, and the clients do all the decorating, cleaning, catering, etc. but that still left the issue of lack of parking, noise, and not being able to have any other guests on site. I asked them to come up with a figure for "lost" income from other sources (activities, camping, etc.) for us to host a wedding, and whether they though the organisation would allow us to refuse a weekend booking to members in favour of a wedding. That idea went no further!
Some months later one of the staff suggested that we should consider hosting "business breakfasts" - there was a group of businessmen from the local Chamber of Commerce who held monthly (on a Friday) breakfasts, currently at a city hotel, but were looking for a new venue. As we had a large dining room with conference facilities, and with a separate entrance from the main house we could host these without interfering with any guests who might be in the house. These meetings were attended by anything between 20 and 60 businessmen, starting at 7.30 and running till around 10.00, so could be a good source of income - my assistant knew how much they were paying and felt we could match or beat that price
I paused briefly before responding, to collect my thoughts, and said I didn't think it was feasible - and before I could elaborate was immediately accused of being negative and rushing to decisions.
So again I enumerated my concerns:
1. If we are using the dining/conference room for these meetings where will any residents have breakfast?
2. Noise? 20 or more businessmen directly below some of the bedrooms.
3. Parking is still an issue - typically businessmen travel alone to these meetings so we could have 40 or more cars to find parking for (when we have space for 20 - assuming we have no other cars already in the car park)
4. With the event starting at 7.30 we would have an influx of people around that time, parking next to our largest campsite, and walking up to the main building past what could be several hundred children (schools or members) early in the morning.
5. Catering - our cook works Friday evenings as we usually have groups in most weekends, so we would have to get a contract cook, and waiting staff, to service the business meeting, and they would have to start probably an hour before the meeting commenced.
6. Toilet facilities - although we could shut them off from the main house we only have 2 toilets serving the dining room, one of which is our downstairs "accessible" toilet
7. Attendance at the meetings is voluntary so we would have no way of knowing whether we were getting 20 (or less!) or 60 delegates, so there was a great potential for wasted food, which we would have had to prepare ahead so it was ready for the 7.30 start.
8. Finally, although the meetings last till "around 10.00" this was not absolute so we could have delegates hanging around in meetings till later, making clearing the room difficult, and possibly even impacting on lunch preparations for any residents.
There was silence from my assistants - again they had not really considered any of these, but then both expressed amazement that I had taken such a short amount of time to assess all these factors, and come to my conclusion. It taught me that reaching a decision quickly can appear as though you have not given it due consideration, but I hope it also taught them that there are people, like me, who can analise something fully in moments, and are not rushing to a ill-conceived decision just because they do it quickly!