Well thought through on the token bit and i think that has a lot of merit in terms of the idea itself. +rep for that. Oops..cant rep u just yet as i need to spread it around it seems..
However for the example you have mentioned it might still not work. You are assuming that the hourly price of mod fap service will not change, but it will if cost of the mod fap itself goes high. The price would go high because people would start coveting the mod fap/imp faps and other high end gears. Eventually say there are 30 mod faps. Not more then 10-15 are in hands which would actually be available for sale. Now suppose i buy all the 10 of these faps, not a tough thing to do. I could pretty much decide the price of the fap service going forward on it along with mod fap price. So, I could still charge x amounts more then the rental fee and since there are times that we cannot do without mod fap , people would still pay.
Next change would be say all the sga/ten edition and adj/imp/mod items are not available for rental itself. So basically there is a rent/non rentable classification put in place to prevent polarization of items. We will need to consider the impact on L items and balancing the rent token tt value to the mu on the L. Personally a headache which i think MA do not need right now. There is plenty of stuff they need taken care of and this should probably be left aside for the moment.
Added After seeing John's post : And yes people will still want to bypass the rental system and then blame MA for the cost and how they thought they were "safe" even outside the rental system and got screwed over