If you feel as though it will set you in the wrong emotional "place" by not tipping him then do it. It need not be an extravagant gift and it also need not be cash.
Go to Costco, spend $200 on a case of booze. By some decorative "bottle" holder and give out bottles of spirits as a holiday gift.
This way you won't feel as though you have been cheap or over generous. Cash always makes you wonder. Booze is pretty neutral. If you want to go really crazy, a case of Vueve Cliquot champagne goes a real long way.

But as long as we are on the topic of tipping..

Do you tip:
Mailman?
UPS?
FEDEX?
Gardner?

Lets say you live in a house (apt's are different)..
Who do you tip?

B

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"When two people agree on everything, one of them is not necessary" - Arliss