Does the rake kill O8 this bad?

[Pokeraddict]

So I am using Pokertracker Omaha. I play 5-6 max O8. I have accumulated over 30,000 hands at one poker room. No one with 300+ hands is a winner. Although in a combined 30,000 hands at 3 other rooms I am + 1.7bb/100 I am -5 bb/100 like every other player with over 300 hands. It is mind boggling.

Can anyone explain why this one room would have no long term winners? The only short term winners are ones with very high VP$IP. Obviously these players are not menaingful with such a small sample.

Whats going on at this one room? Is the rake just crushing the games because everyone is of equal skill? My sample with the other 3 rooms combined makes me know this game is beatable.