I'm with 4X4 on this topic. During the second world war the Australian soldiers used to complain about the Americans being "over-sexed, over-paid, and over-here" and nothing much has changed except the rot has spread even further. Tipping might have become a part of the US scene, but that is because the American workers have been and still are being exploited by their bosses paying minimum wages that nobody can live on - so the remedy for that was for the customer to be forced to make up the difference.
Most of the rest of the world doesn't run on that system and as has been stated, those who flash the multi-dollar bills around as tips that aren't expected in third-world countries are just screwing up the local system.