Tipping?

In France you don't really leave a tip for anyone, taxis, hairdressers, waiters. I guess it is polite sometimes to leave a couple of euros after a meal if it was exceptionally good or if the bill was really big. Just in general though there is no tip. I worked at a restaurant for 4 years, since I was 16 and I hate people who don't tip back home. I always wonder what the people in these service jobs make without the tips, since I have paid for most of my college and previous Europe trips, and a summer in China almost solely off of tips.
My neighbor and I ordered Pizza Hut pizza for delivery (online = awesome) and when I went down to get the pizza it crossed my mind that maybe I should tip him. He did drive all the way across town on his little motor bike in the rain to get us our fatty American food piping hot in less than 30 minutes, back home he would have gotten a great tip..but here who knows. My hesitation and my French combined did not clear up the confusion so I just handed him 3 euros and got a really strange look in return, so maybe they don't get tipped, or maybe it was a "thanks for the crappy tip"look. I don't know.