I am open when trainers approach me about using my facility (a smaller, 24 hour gym). I don’t have trainers on my staff here and use independents anyways. I negotiate a split or fee with them. I have had times when the trainers client has then joined my gym. Owners are always open to that and maybe even giving a discount to the trainers clients if they join. Never hurts to approach local, gyms and see what kind of a deal you can work out. Good Luck.