I think one of the things I look for is flexibility. Which is partly why I bought Wardrobe Wizard -- it lets me get more use out of expensive items. Flexibility and a touch of imagination. A sci-fi Vicky-in-Space doesn't need to wear something styled like a swimsuit. And I'm not keen on outfits which have several distinct meshes, all UV-mapped onto a single texture. It's wasteful if you want to mix-and-match. Anyway, as an enthusiastic amateur, I'd not want to pay a lot for something I might only have one use for. But I can see how somebody selling their art would be willing to pay money to save their time.