Leasing Program for Rental Comapnies

We've received several inquiries from rental companies interested in purchasing a phone.
Interest wanes when it's discovered that substantial audio processing is required for each event.
Accordingly, we think it makes the most sense to lease phones under the terms below. We're open to suggestions, so let us know if you have something different in mind. Thank you!

Lease fee of $100/phone per month; Discontinue any time
Fee includes 2 audio processing credits (2 events)
Additional audio processing at $50 per event each month
Credits roll over if not used, with no expiration
Rental companies won't be held accountable for damage, simply send phone and components back to receive a replacement.