A: On The "Tip" Of Your Tongue
Excuse the terrible title above, but my point was the best tip anyone can give in any business transaction is a kind word of mouth referral. Contractors should include all wages, fees, and product specs in there quote. Tipping is solely at the discretion of the buyer at the end of the transaction.
I have been given bottles of wine, champagne, movie tickets, gift cards, and others. They are great to receive, but my job is to complete such a job that they swear by my work to everyone who sees it or asks for a contractor they would recommend.
All of the above answers fit the question. No one should expect a tip. In the end it is truly your decision, but do not feel obligated to give a tip.
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