I stand hard firm on the basic keeping at 30, the most they can push for is 30/70/100. If they push harder than 30 for basic they can cheat the next guy and I most likely won't ask for them again. I get annoyed when the ML try cheat you the 20 when you pass them the 50 by "forgetting" the change. I do tip extra sometimes on regular MLs outside of the usual rates as a thank you gift every so often but they know never to expect more then the usual.