people that work for tips KNOW who tips and who dont. Call it a 6th sence but when a tip is put into the jar she/he knows even if she/he doesnt see it directly. and while it is nice to have your contribution accnowleged it is appriciated. Please know that sometimes when we get busy it is hard to take the time to show our appriciation. Working for tips is diffrent than working for a paycheck because servers are expected to show thier appritiation constantly thu out the day and can become mundane at times.