Well, I don't "tip" him, but I do help him out... my "dealer" is also a very good friend of me.

So, sometimes I go over and help him do two or three things around the house. Sometimes he smokes me out, sometimes I smoke him out (with his weed). I don't tip him, but there have been occassions when he needs like $200 to cover an entire ounce, and he calls me up and asks me for the $. Of course, I give it to him.... then I get some sweet $200 worth of chronic.

But tippping as in "Here's $5, thanks dude!"... nah... unless he drove out of the way... but, nah....