psychology behind my lot

Well you receive some earning for posting and answer questions, evertime you reach the minimum amount you feel ok and this makes you wanna keep posting or being active here cause at the end you are sure you're gonna receive a kind of prize. It's like children at school, and parents give them a gift or a surprise everytime they got good grades :)

no psychology, just because money was tight, and as students, i sit in front of computer a lot, so might as well, i should do something useful.. like making little money..

The type of psychology that drives us towards sites like mylot is money. Money is the motivation for people joining all of these sites. They think it can earn them a few dollars extra which they could use.