People do constantly turn a profit playing poker, obviously poker does have a luck factor in it which causes variance but if you make the correct choices then you will come out on top. For example Phil Ivey has made over $15M playing online and won around 8 1st place titles in live WSOP tournament poker, there is people online who play 15 - 20 tables at once who just play basic ABC poker and make a steady profit. You did obviously get lucky winning 13 buy-ins in 3 hours but you must of did something right.