What is a Fair Rake?

[DeadMoneyWalking]

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Also along these lines, I have always wondered how much more rake I should be willing to pay if the room is underground. I think it is fair for them to charge more since they are taking a larger risk than a legal room.

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The players are assuming a lot of risk too. I think it should be lower. If one had a choice between an underground and a B&M, what would make one prefer the club?