I tried to work some magic at a local non-extras club. Alas, I was denied.
But she did grind pretty well and I managed to LDK. I paid $80 for 15 minutes and tipped her $40 for the LDK. What would you have paid?
Also, should I have told her about my brilliant dachshund friend and pet frogs? Do you think that would have swayed her toward some more hardcore action?

I am a frequent LDK or LapGasm Disciple my self so I will express my two cents on the subject
some as the Master LDK himself goes the cheap route and I do believe he dosnt tip extra for what he feels is already factored into the price but I can not speak for the Master himself and I do not have this on any authority just my thoughts from talking with him over the years.
my actual method sounds similar to what you did 4got. as a rule of thumb I tip 50% of what I paid for if I cum.
a few examples
if I paid for 5 dances for $100 and had a LDK I would tip $50 extra
IF I had paid for 1 dance for $20 and LapGasm I would tip $10 extra
I believe you get the point