I agree with Hambone, in that, sure you were really grinding it out to make that $280, but you learned a lot in that time, in more than one way. First, you must have employed some good bankroll management skills, because when your roll is down in the <$10-20 range, it is very easy to get bored one day and decide you're going to play a $10 buyin and not cash in it, crippling your BR. Another thing that was very beneficial was the amount of hands that you must have played against some really terrible players, and you were able to circumvent their bad play and pull through.
Put it this way, you were able to go from $0-280 in 6 months, playing at the micro stakes, so a 280% return. If you would have deposited $50 and had that same luck getting the 280% return, you would be up to $14,000. The catch with that is though that you realistically wouldn't be up to that, because you would want to go up in stakes, probably when you weren't ready to and you would be playing better players who would stack you, and you would be down in the dumps. Staying at the lower limits for a while isn't a bad thing, especially when you're making money. Once you get to the point where your bankroll can support a move up in limits, go ahead, just make sure to move back down if you're having a hard time.