Seller's and Unreasonable Pricing

I am new to the RV world, i have not yet purchased one yet. After reading these posts i am more confident about my small budget of $10,000 for a used class C. I do have a reasonable expectation of buying an older 2000 model. I see the dealers are very high priced for me $50 to $80,000 for a 2004 model in my opinion is just ridiculous... So I am curious if my budget is small or unreasonable? I am in no rush to buy, so if i need to wait and build up my budget i will. I do search craigs list alot, and i have been on rv trader also. I did see a 2002 27 ft class C for sale up the block from me, but the guy wanted $22000. i do not want to finance, so even though he said it was negotiable i didnt offer because i figure he would have said no anyway. so what do you guys think?