FOLLOWUP (responding to comments): I'm not concerned about the women in the pictures. They freely chose it, and made enough money to make it worth it to them.
But things that reinforce the societal ideal that women's value comes from being conventionally attractive is much more deeply damaging than most people realize. It leads to the body image issues that the majority of young women grapple with. Anything that makes it seem like numbers define how attractive you are is especially bad, because it makes it harder for people to accept their own non-ideal bodies as beautiful. It encourages young women to spend vast amounts of their free time learning about and working on being attractive rather than, say, tinkering with computers. To some extent, it leads to income inequality between men and women (Girls grow up with the message that pleasing men, by being attractive among other ways, is good, so they tend to up more passive in many situations. This makes them less willing to negotiate for salary, less willing to go out of their way to take credit for their work, etc. It also leads to other bad things like being less willing to say no to sex.)
I like seeing racy pictures of girls as much as the next guy, but displays of women like this, especially right next to and in the same format as rental listings, encourages societal ideals that are at the root of most of the gender-related problems in our society.