yeah i'm a free person...paying for it i wouldn't be able to do it, 10 to 20$ is ok i guess.
but there are workshops that go through very advanced stuff that cost anyware from 400 to 500$(CG workshops)
if people pay that for a full month class basically, how much would they pay for a tutorial that provides no direct instruction and takes a few days? plus there are DVDs/videos for programs that are 20 to 60$(gnomon). theres actualy a car modeling tutorial in pdf format for 3dsmax thats 117 pages and still going, the tires the rims the exhaust , the body quite alot and its free(link)!
wha i'm saying is your tutorial has to be pretty darn special if you want to charge for it...just my thoughts...