We provide: whole mining device excluding PSU.
You provide: PSU, location, operation.
On each difficulty change, you pay us:
(x - 4.59*10^(-5)*t/y)*80% in which
x = 100% PPS of 850G
y = Bitcoin exchange rate on bitstamp
t = seconds in the last round
This is per device.
4.59*10^(-5) is electricity cost per second assuming power is 0.15$/kwh and each device draws 1.1kw.
If (x - 4.59*10^(-5)*t/y)*80% is already equal to or less than zero, or after three months and you decide that the project should discontinue, you can either sell them at market price (which is agreed by us) and pay us 80% of the sold value, or ship them back to us.
After that we give the deposit back to you.
If you already have (or have cheap access to) PSU hardware, and you don't have a more attractive franchise offer on the table, I still fail to see where the franchisee's risk lies.
15c/kWh is a very fair allowance for electricity. I'd be surprised if many large scale miners pay that much.