I know the feeling. I've got a 3 bay shop with lifts. The common thought is that they won't need to bother me with fixing their cars if I just let them use the lift and tools. Of course, they might need some free advice along the way. Shouldn't be a problem since I can only use one at a time anyway. Sometimes I wonder if I could make more renting the bay by the hour, renting tools, and charging for advice. There would be a lot of CYA on liability and most of those type don't feel there should be any charge for that kind of thing. After all, they are keeping me company! If you ever figure them out, let me know!
All ya get is a headache figuring that out