Ok let's do some math here. If you have to give up four tables for four hours. Let's say the maximum you can make on those four tables is 8 dollars an hour, ok. That would be $32 an hour x 4 hours would be $128 dollars. That is a best case scenario for the room owner. In all actuality it is unlikely he would lose any of that money if it's being done between 11:00-3:00 because I have rarely seen poolhalls even half filled during those hours. So if he dismissed it out of hand without even qualifying how it would go down or when etc..., I don't care what his clientele is, that is bad business.
Ok so if it brings in even 10 people, you can expect that atleast half of those people would want to get lunch during that time frame, so you can expect atleast half of the money to be returned immediately with ten people showing up, if you also get the hard core players in your room aware of what will be going down and get them to try adn bring in people, (a little advertising with some flyers etc.) it costs you another ten dollars in printing costs, or you can ask for flyers to be provided by the guy holding it, if you get 30 people in there that wouldn't have been there on that day you can expect several things, one not only the recoup of the lost table time, but you can expect a profit just from food and beverage sales and then players will want to play or practice some of watching or participating in the event, Hell, you can even hold a tournament the night of after the exhibitionand get the people to stay even longer.
The questions I would have as a business owner given the prospect of this are; what time of day and what day of the week would you be planning this? Are you going to be charging the clientele for this exhibition/pool school and or for just the pool school but the exhibitions will be open to anyone? What order will they be given in? Could we possibly work something out so that you give the clientele a chance to play a game with them or set aside some time for the clientele to pay 5 or 10 a game to "play a champion" and have some of that money go to the house?
The thing here is that not qualifying what would be going down and or negotiating a chance like this is just bad business regardless of where you are. One problem with a lot of poolrooms is that the owners aren't necesarily good business men. They either just have a love for pool or want a bar and use pool tables to give their patrons something to do.
There's my .02 cents