Do you ever "tip" the garbage collector?

[volcs0]

We're getting ready to move, and for the third week in a row, we have a large collection of trash. In addition to the cans, we have tons of boxes and big bags of trash from clearning out the basement. This week, I even have an old set of shower doors, that I hope they take.

Should I give these guys each a $20? So far, they've taken everything, and I know that our town has some garbage limit, that I'm sure we're exceeding.

Anyway, I was going to give them some cash today, but I was wondering if anyone else had done this.