Yep, advertising "we have the lowest rake!" is not gonna bring in the fish at all. Their response will be, "So when I win a $50 pot, instead of having $3 taken out, $2 will be taken out... who cares!"

The fish like freerolls and bonuses and such.

The one thing that might get their attention would be automatic rakeback. "Play x number of hands per month at x level, and we give you $100 a month whether you win or lose!"

$100 bonus, $100 a month (or $1000, or whatever, depending on stakes played), that is what fish notice. $1 per pot rake difference, why, that's nothing!