Limit hold'em is full of swings. Even crushing winners probably don't win a lot more than 50% of their sessions, but I'm not sure what a session win % stat would be because most people don't pay attention to that. You can manufacture that stat as a losing player -- just never quit when down until you have lost a ton of $ (chase losses) and quit immediately when up (lock up wins). This is a terrible way to play poker, but it will give a huge winning session %.
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. One rack was definitely not enough to buy in for and I should have taken my almost one grand profit when I had it but I got greedy.
A stop win is a bad thing. In that kill game, you might have been up 18-20BB? You might have won 2 big pots? That's just variance. If the game is good and you were playing well, why quit.
If you look at your high water mark in a session as "the money I've earned" and then any loss below that as "getting greedy", you're just in for mental torment. The amount of money you have in front of you hand to hand is just variance. Here's how a well rolled player sees it. You play some hours, your stack goes up and down. You quit for reasons related to having played long enough, the game not being good, or (rarely) you not being mentally right. If you're underfunded for the game, this seems even worse. That's another reason to have a roll you won playing poker, as it helps weather the swings mentally. Your OP seemed kind of a casual "I can afford to play this game, how much might I need". This post makes me think I read that wrong. Comfortably rolled as a non-pro for this game would be 400-500BB.
This stuff is magnified in a big kill game where people might play especially LAG once the 3rd blind go in and the stakes go up. Around here, we have a 30/60 game with a 50/100 kill. In a good game, it is $200 to see a flop once the kill is on. People defend their kill, and some defend their kill button. When the game is good, your session results are controlled by a few turns of the card. Did you hit the flush? Did top pair hold up? Did that guy try to bluff in a 4 way pot and my overpair held up, or did he bet and show me quads?