I find the claim of a $5000 gain to be a bit doubtful. My passion sold on ebay at $19,200, which I was happy to get. Most of the smarts on ebay have such rediculously high reserves, they never sell. Mine was the only 2008 that sold within the first week of March.
With sales taxes and ebay charges, I only cleared $2200. The cabriolets seem to be fairing a bit better on margin.
Take out federal and state short term capital gains taxes from that $2200 and it's not worth the effort and risk as a business opportunity.