I can't say it makes a huge difference for me - the IP logging has never bothered me, and as Aly said, it's possible it helps cutting down potential wank. Then again, Kiseki is small and obscure enough that I don't think total anonymity would result in any kind of wankfest. I'd say it can't hurt to try it out for a meme or two and see how it works? It's hardly like the logging can't be turned on again if it turns out anons can't handle the freedom.