If you were very short-stacked, then you perhaps want to stick around and try to double up again to get into profit, but generally you're looking to have enough that you'll have at least 3/4 of your stack when you push in, and with the blinds you'll then pretty much double your starting stake if you win... with the really stupid players, you can play relatively loose, too - if they play literally every hand, then you'd normally be ahead with just AX, and if you're willing to gamble a bit on 3/2 odds
for even money, then it's one way to may the bad players pay more often while losing less blinds between your own plays.
When you do win, generally you then cash out, and buy back into another micro limit table with the minimum again, and try again. Alternatively, when you have a more powerful starting stack from a win, play more solid poker.
It's a strategy that I adopted to try to make something more useful from freeroll winnings - because you often don't have enough to play much more than the minimum buy-in, so you're trying to multiply it quickly into something you can usefully lose a bit of while trying to make a hand. It's like the end-game tournament strategies where the blinds are a high proportion of your stack - you have to pick a good situation and push in,
except you can try again when you do get outdrawn.