I've rented one bag before, and that was to try it out before deciding if I should buy it. I rented it for 2 weeks, liked it but did not love it enough to drop thousands of dollars on it. So i didn't get that bag in the end. I guess it was a good test to see if I really liked it?
I think I would rent bags on my wish list, and if after a few weeks I love it even more then I'd buy one.
This makes sense to me.