How many SNGs you need to play to know ROI?
I've heard figures ranging from 500 to 10k (on 2+2, where say you need at least 300k cash hands before having an approx figure of how you run, ie. winning/losing player). Right now, my sample is very small and my ROI, is, as expected, unsustainable (around 69% if my math is right).
If you need several thousand games, how can you know with certitude if you are good or not at a certain buy-in ? I can't see anyone not running hot/cool enough for a period of time and moving up/down before reaching 10k games.