One stripclub I frequent charges $4.25 for a beer. If I put $5 on the bar most bartendars will give me .75 back. Then I can decide what amount to tip her(always more than .75).
Some will take the change and put it directly in the tip jar. If they do that I don't add to the tip since they made the call, instead of me, on the amount of the tip. Of course in each case they are costing themself.
Considering a tip can't be much less than .75 I don't understand what they are thinking when they do this.
Is this something you occassionally face and how do you handle it(on principle)?

Often times the waitress will round-up (i.e. if something is $4.25 and you give her a $10 she'll often give you $5 back) - IDK if they do this in part to not have to be dealing w/ lose change - I usually tip a buck for my drink since I either buy water or a beer; so if the drink is $4.25 I usually end-up tipping $1.75