I'm sure it's been mentioned before, but how much tipping is required daily to ensure your rating never falls below four stars? It gets pretty frustrating, tipping as much as I can to get to four stars and then some, only to see my rating drop to 3 immediately next reset.

And I know, many choose to not tip partly for this reason. I like tipping, but I don't like how far my rating drops even though I've been tipping regularly.