"They never seem to have anyone filling up there mind, although I guess that they are making enough margin ripping people off that they don't need that many customers. "

You could argue though , that isn't this EXACTLY the type of business model most of us villa owners want to run? We'd rather have half the number of rental Guests paying twice the return? Less wear and tear and overheads etc. IF the price is advertised clearly, and not one of these that doesnt tell you till you've filled up, then just as with any other retailer you have made the decision to accept their "offer" price and , galling though it is, to find out you could've paid a lot less (or got more for your money) there isn't much you can do about it.
Thanks for the heads up though, it's another to add to the list of ones to avoid if at all possible, if you run out thouh you dont have a lot of choice, especially with an unfamiliar car, at home you would probably know what your reserve was.