slow times at the HL

went in on a Friday night about 8pm

parking lot empty - yikes

$10 cover at the door - I think not sure, but I did not tip the girl (call me cheap).. I just don't understand the fact that I have to tip a person for TAKING MY MONEY - that is all she is doing. Is she even making conversation with me -tits? pussy? nothing - takes my $20 and gives me 10 back. Is that so fucking HARD it deserves a tip?