Im thinking worse case senario.
Shit can and Will happen.
Believe me I would love a place where I could go rent a hoist for a few hours, but only if every avenue was covered to ensure the saftey of people and the cars.
Also what about theft? if you leave your car there for a week, Cameras would help but wont stop nosey buggers sticking their dirty fingers in your glove box or taking a liking to your gear lever
So calm down you overly sensitive twats, I am trying to offer all sides of the arguement, where you will have shit heads messing with peoples stuff, stealing your tools blah blah.
On the other hand, a big(ish) parking area for customers who have something go wrong while the car is there so it can be moved off the hoist and at least moved out of the way, sounds better than charging them double and having a hoist out of action, even if you charge 20 bucks a day for the parking area.
What would you do about staff....as in what would the job description be? you counldt just have them sitting around all day, maybe a qualified mechanic how can offer advise and/or lend a hand where needed. Would help turn around times if a car is going to run over time.