I guess it all depends on what you're interested in and how involved you are in supporting other people's projects. I buy a lot of skins off the unc-crew manialink, for instance, because I want to support them and I also like using the skins for screenshots and videos. Maybe you're really good at skinning and do all your own skins. I'm not, and I don't.
My point is, even if planets seemingly have no use for you personally, it doesn't mean they're useless, and it doesn't mean they're stupid like some people try to say.