I haven't winterized mine yet either. Last year, i broke one thing, and discovered two other things that were wrecked when i tried to winterize it, so I ended up having hobo camper country winterize it for me while they fixed it up. I can't recall what the cost to winterize was, but I'm pretty sure it was less than the $80 mentioned.
I plan on doing it myself this year, and if I do it right, should be 8L or less of antifreeze. I also have access to an air compressor this time, but somehow, seeing that pink stuff come out the taps is reassuring.