firstly 200 games is nothing. come back when you have 1-2k games. 1 top 3 finish and you are suddenly 120 up and looking great.
Second they should still be beatable, but gone are the days of 50-100% ROIs in these games, they are and will continue to be reg infested. So back 4-5 years ago this format was easily the most profitable, now it still is very profitable (assuming here) but there are way more regs to contend with, so the variance is much much greater as edges diminish.
You really need a very solid roll to be serious playing these, i would say 200 buyins to be safe depending on your skill level.