Paul Wilson - Yes, very true regarding "Insure" and "Ensure" though I'd put this as possibliy down to changes in language in the past 300 years. But it got me thinking and as you offered no alternative I did some looking and found this:
http://www.snopes.com/language/acronyms/tip.htm
Good to hear that others get reimbursed for tipping with your companies. I guess it's more prevelant on the western side of the Atlantic as I've not heard it happened to the East.
My main problem with "standard" tipping is that employers can use tipping as an excuse to pay employees below the minimum wage. The employee should be paid a fair wage and then if a tip is received, it's a bonus (IMHO).
Cheers,
Chips