NOT following back on tumblr?

Mate, don't worry, I following only *checks* 50 people, but I have a few thousand followers and none of them seem to mind it, when someone wants to be followed back they normally message me, and I'm honest, if I don't like their blog and they post nonstop, I'll be like, no thank you, but if I do like it, I follow back and say thanks for telling me to check out your blog. So don't worry man, if the person is bothered by you not following back, they'll message you.