Just don't be upset when some people respond negatively saying that the guys are paid a salary to do their job, and they don't deserve tips or anything above and beyond their meagre paycheck.

There is growing dissatisfaction in some parts of this society with people who insist on paying their maid 1500/month, or tipping, or giving cash bonuses to tea boys. They feel that it's making things too expensive for 'ordinary' people.