There's the top tier: Bookmakers who spend a lot on advertising to get new players on the site.
And the bottom tier is smaller skins. Speed poker and PLO are not segregated between the two, dunno about tournaments. NLHE cash games are segregated up until 2/4 i believe, you should find much better games in top tier.
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But is there any segregation within a skin? Segregation by winrate etc?
Don't think so, never heard about that.