NLCASH - limit vs rake

[The72o]

I have no idea how to check this out.
What do you think - on which level the rake is not that big part of the pots (so winrate also) so you can play it more profitable.
Somewhere I red that playing for ex. on NL50 is very hard because of that, you need to have higher winrate just to beat the rake.
What about higher levels?

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Thanks

PS. Sorry for my english, it's not my native language [img]/images/graemlins/smile.gif[/img]