I've taken a few for those purposes and have never had any serious issues. I've had one or two take to calling/texting daily and/or copping attitudes when I don't respond, but its easy to blacklist numbers & usually a quick conversation on the next regularly scheduled visit clears it up. Even if you are fairly selective about exchanging numbers you do have to be able to either ignore them and write them off, or actively correct their behavior.
On the plus side, once you establish that you aren't running a charity but are willing to exchange money for services, I've generally got good value. Not just mileage wise, but general info as well. While its very much different from other relationships, I have found the minor investment in keeping a few "stripper" relationships going to be worth it.
And Bavarian, I'm with Papi, 1100 for an hour and a number sounds awful steep. I'm not that interested in a number with that sort of price tag. At those prices, you might be right, but I think many here will attest to Chris Rock being wrong about that.