It's easy. take the $11 reimburse shops, not the $11.50 reimburse.
you won't see the bonuses until at least the 10th of the month or later. my $20 shop was like december 20th.
they will bonus, but it's not quick and in the beginning of the month.
also, some areas might be more saturated with shoppers, so maybe shops don't get bonused as high.