If you play Zoom or other "fast poker", then you can try it. And you can return , when you lose 2-3 buy ins. I can tell you about the difference between NL2 and NL5. NL2 is the lowest level. There are some people, they don't know even the rules. There are a lot of "All in apes". It is easy...At NL5 still very weak players, but there are also some weak regs. Or "reg like"...You can make a similar win rate (still will be lower), because there are less people at NL5. If you have HUD and you can use it in a good way, then NL5 is a good option. Try it...But if you play "only against the field", with this win rate (8bb at NL2), don't do it. Friendy advice. Just learn some things, practice more, you will be better one day. It is not "a shame" to play NL2. We all did...This is just a school. "Must" school...
And about the roll...50$ is enough to play NL5, but this is the minimum. An "aggro roll". Still, this not a
gambling, not at all. But you must go back, then you lose max 3 buy ins, 300bb. And this 300bb "downswing" is pretty common. Like "all day, every day". You must know this, you can tilt very easily otherwise. But 50 buy ins swings are also possible, pretty rare, but possible. It is a waste of time to try to "build" $300 for NL5. And 600 for NL10...
And don't use short stack. Never
!