Gotta suppose it's one of those regional things. Gotta also state that policies "might" be tossed in the trash too if the amounts were significant.
Sea story time.
Several years back, there was the motor home/motorcycle rally in a campground designed to handle thousands. There was less than a hundred RV's and all millionaires.
On the last night of the three nights contracted to entertain, one southern fella (slightly tipsy but not blasted) came up and asked for a Merle Haggard track figuring no yankee would have it. Playing his song next, he came right back up beaming, happier 'n pig in poop, and slammed a bill in my shirt pocket, then asked for a Willie Nelson track, which I played while he was standing there. Slam. Another bill into my pocket.
Don't know about you, but I try to be cool, somewhat protesting that tipping is not required, but then again, saying to myself internally, it's friggin money Bubba, and I like money, especially if its free.
Many others came up making requests, and, for many, it seemed as though my shirt pocket was a basketball net and folks were practicing for the national slam dunk tourney.
As the night wore on toward its conclusion, curiosity got the best of me. Went to the restroom and checked the contents of the pocket. There were two one hundred dollar bills, two fifty dollar bills, and another hundred sixty bucks in twenties. $460.00 in tips in two hours on a Thursday night.
The moral of this story? When it comes to free money, thou shalt protest meekly once, then if the gracious giver insists, consider it equally as rude to decline their gift as some seem to think it is to accept it.