Renting vs. Owning - Looking at cars

So, if I'm going to come up with a price for renting books, I need something to compare it with.
How about cars?

Not the most obvious choice, but if you want to think about renting something with lots of restrictions, car rents might be the ticket:

Restriction	Rental Car	Kindle	Conclusion
Sharing restrictions	Only "Authorized Drivers" are allowed to drive a rental car.	Only a single "Authorized Kindle" is allowed to show a book at a time	Rental cars are less restrictive
Usage restrictions	You can do whatever you want with the car, so long as you don't damage it.	You can read the book, but apparently you can't use software to read the book out loud to you without permission.	Rental cars are less restrictive
Cost	Cars cost about $20,000 and rent for about $30/day (before insurance).	Books cost about $8 and rent for about $8. Insurance isn't offered.	Rental cars are a lot cheaper

Conclusion -

While renting a car can be a great value, renting a book is a much less consumer friendly opportunity.

Kindle - FAIL