How do I handle this situation?

[absentx]

Okay, I need help here, probably could post this in theory but, the small stakes forum always has the best answers.

Alright, I will make this quick. I normally play 1-2 or 2-4 online, and I am always just a tad above break even, over 500 hours of play. Now, when I play live, I always play 4-8 or 5-10 and I do just fine playing that.

The other day I sat five ten on Ultimate Bet, and over the past 30 hours of play I have brought in over $900 playing the five ten games.

I dont have a specific poker bankroll, I have a job, so that is my bankroll. But obviously there is a lot of money in my UB account right now. Do I keep playing 5-10, or did I get lucky and I need to stick to the lower limits? I cant believe it is all luck, because sometimes those players at five ten are just as crappy as the one two players.

I know they say you should have a 300bb bankroll for the game of your choice. Now does this assume that even if infact you are the greatest player in the world, it is still possible that you may face a lossing streak of near 300bb's?