Not really, you just haven't been playing many hands, and there is a non-trivial (but unacceptably small) chance of you not going broke (at least until you break the assumption of not moving up _again_ without moving down when you're reduced to the same level) provided that you are a winner.
It is possible to get away with appalling bankroll management once, but unless you move up and down in a responsible manner from then on, you increase your chance of going broke until it's a near certainty, and if you manage not to fall into that trap, there's another waiting. Not understanding the mathematics of bankroll management nor trusting those who do, you are very likely to make unsustainable cashouts; that too is part of bankroll management.
Nobody is good enough to win at poker long term without proper bankroll management. Not the top pros and certainly not you. You might get away with this particular decision (although it's at best a coin flip for you going broke), but what about when you decide to take your next shot with a single figure buy-in count? Or take out all your winnings every month and trust that you can still maintain your bankroll (this is mathematically impossible)?