This just happend to me yesterday though. I called a guy about a moped for sale, and he agreed to sell it to me. I told him I would be there in 40 mintues, and left. half way there (after 20-30 minutes of driving in traffic) he called me and told me someone was giving him $25 more and that he hoped I wasnt on my way. The bike was already gone, and I was out $10 in gas.