alt Hacker NewsI run Brick Ranker a website that tracks the value of LEGO sets and minifigures. You can also signup and catalogue your own collection so that you can track it's value or just see what you own.
It makes around $500 a month from a mixture of adsense and affiliate schemes. Would be good if I was making more but I've automated most it so I spend maybe 1 hour on it a month.