I guess it depends how you look at it.
It really made me quite sad because one of the girls who was interviewed for the documentary on it (she used the site to pick up sugar daddies) said that she wouldn't date someone who didn't have a lot of money.
I can't imagine that way of life ever being fulfilling.
At least with an affair it has room to grow, because you may love the person and end up leaving for them, but with that it's just about greed and lust - I'm sure plenty of affairs can be about that too. But anyway, that's just my opinion.