Because I can. All it does is give me a little icon on the homepage when someone I follow is online, so I thought "why the hell not follow loads of random people". I lose nothing, but gain...uhhh... I'll get back to you on that part...
I'm following you Industrial Miner because you make good posts, and seeing your profile picture on the front page is easier to find and click to see your posts. Can't comment on your profile though.