I also store cars if I have vacant spaces in new warehouse units,CTEK charge,2 post lift etc. with own digital key,so unlimited access. In 10 years I have never had any problems with clients. There are two key considerations for customers,1. How far away from home is the storage,2. The cost. I charge A$215 per month to store three cars,which is way lower than almost all the commercial outfits who rip off the customers. I store cars outside on the hard stand for free. Since I own the units I need only charge enough to pay the outgoings,which I think is fair. Most customers own expensive cars they really can't afford,so cost is a major consideration.