I'm with you Hentai Man.
I pay $40-$50 for the 1/2.
And I tip $100.
Recently I went to a SMB spot and got some serious Dead Fish style service from a young Latina who asked for $120, but took my $100 without blinking.
I posted about it here and caught a bunch of grief about low-balling and getting the service I deserved for being cheap.