A common occurrence I (and many others) experience is when up-coming musicians/bands/athletes go follow random people on Twitter and Tumblr. For me, I check my new followers often. If a new follower seems interesting, I’ll follow them back. After a while, I notice they don’t follow me anymore. This is a pet-peeve of mine because it shows that the band/athlete doesn’t actually care about their fans and just cares about having X-number of followers.
Basically, if you followed me and I followed you back, you should stay as one of my followers.
I hope that made sense.