I have some thoughts on this.
Who wants to fuck a doll?
Well, it's kind of a fetish, just like all of the other wild & crazy stuff we enjoy. (This includes all of the topics on Zity. I've seen more than a few people flabbergasted over why anyone would enjoy enemas.)
With doll-fucking, you have something completely under your control, that you can do anything you want to, and it won't resist you in any way. It's not my particular kink, but I can imagine how someone would like that. It's not necessarily a replacement for sex with a real person -- just something you could do in addition to live sex.
Personally, while I'm not into dolls... I am into weird. So I can see myself giving a doll a try, given an opportunity. (I'd guess I'd find it unsatisfying, but it's at least something I could check off my list.)
Who wants to fuck a RENTAL Real Doll?
Probably not me; it's not a big enough kink for me that I'd go that far. But if you have a doll fantasy or fetish, and don't have $10K to spend, then this looks like your next best option.
FWIW, RealDolls generally have removable orifices, and high-quality silicone can be sterilized by boiling and/or bleaching. So, with proper maintenance, it's definitely going to be cleaner than any live person you're sticking your dick into.
You would be right out there in the open, boinking your new silicone sweetheart.
Again, this could be part of someone's fetish for all we know. Lotsa exhibitionists out there.
You think your job sucks? At least you're not the orifice cleaner in the Real Doll rental department.
Sure, but that comes (ahem) with the territory. I regularly volunteer with setup and tear-down at our local sex-positive BDSM events. The work is mostly mundane, but you have to be prepared for body fluids -- so you glove up and focus on doing a good thing for the community. Just imagine all of the fun someone had in part because of the help you're providing!
Also: if this club has good standards, they'll probably have a policy that you clean your own spooge out of a RealDoll when you're done with it. The less you're exposing others to your own pathogen risk, the better.