While I first came to Danbooru for the porn, I stayed for the very cool note system. This way, I get to practice my Japanese- and see how other people translate too- without spending a lot of time/money on getting raw material. Since a lot here is manga or casual, I can also experiment with more context-sensitive translations instead of going for strict accuracy- great translating is an art, and I could use the practice.
But I still enjoy the porn very very much.