If you hang around you are gonna lose money, unless you don’t mind hanging around for free.
You can insure your gear for the abuse/theft bit. Add 6% to the bill to pay for the insurance fee.
Furthermore the going rate here in Holland is 3-4% of the list price of the materials. So jus add everything up, calculate 3-4% and you have your rental fee.
This obviously means you’ll be renting it out 25-35 times before you made your initial investment back. Then you have to make some return on investment. And all that is not counting your hours, but based on pick up/drop off by customer.
If you are really worried about the abuse/theft bit, perhaps you shouldn’t be contemplating renting your gear out (I never do, only for gigs where I either DJ and bring gear or where I do live sound). In both cases I get paid for the work and am automatically in charge of my own gear.
Greetinx,
C.