Many are subject to greed, but when you win a good amount of money, the most logical is to participate in cheap tournaments and micro limits in such cases. Firstly, it gives even more practice (after all, entry is cheap and you can play a lot of hands), and secondly, it will show you whether you are really able to get into the prize zone in 20-50% of cases, in order to ultimately continue profitable strategy, but not loose.
I don't think this is a subject of greed, at least it is not for me. I play for money and I want to play for what I think my time is worth. I don't want to grind out 10 hours to win what I would make in an hour if I worked. That just seems counter productive.
I am afraid that in this case there is a very great chance of losing everything. I know people who, after winning, raised their limits and lost almost everything