I'm thinking about adding the ability to rent magic items to my game world. It works like this:
1) You put down a depost equal to 110% of the cost of the item. So if you take the item and run (or get yourself killed and never return), the item is paid for.
2) Rental cost is 100 gp, plus 1% per day or 5% per week, plus a prorated cost for any charges you used. Taken from the deposit.
3) If you haven't returned the item within 30 days of when you said you would, the item is yours, the deposit belongs to the shop.
4) You can pick up the remainder of your deposit 24 hours after you return the item. This gives the shop time to magically check the returned item to make sure you're not scamming them. It's also where the 100gp set cost comes in. (Taken from the cost of an Identify, though the shop would have cheaper means to check the item)
5) If you decide to buy the item, you get credit for 1/2 the rental costs you've paid on the item.
Thoughts?