could somebody explain something to me?

On this forum it seems to be that everytime someone posts that they've played x number of sng's at one level (for example the op's amount of sng's at the $11 level) people condem him for not moving up already..."what are you waiting for". and then on the flip side, the same people say how every single sample size is way too small to get real results.

So people should move up after beating a certain level after x number of sng's played....but that same number is not a reliable sample size to determine if they are actually beating that level?

I'm confused....