the rake in poker

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Im my town, gas is about $2.03 a gallon. There are 50 different stations and the prices vary by less then .03 If you drive a few exits up the interstate, you can find it a $1.90/gal. In other states, I hear of it as low as $1.70/gal. So, if selling gas is still profitable at $1.90, wtf happened to the competion in my area?

Why arent the gasoline prices driven down by competition within each region. Why does every cardroom whether they have a 100 players or a hundred thousand still charge the same rake?

I think its a little bit of an implied price fixing. No one wants to lower the rake now because once they do, there will be no turning back.