Why is it so hard to buy parts from people

i am fed up with market place, i ta;led to a guy about a rust free fl truck cab ,he called me only sent pics of cab with doors open i asked for cab inner rocker pics he said its just as clean as outer rockers, so i drove 300 miles last friday to buy the truck ,get there at 3pm he wasnt there, he showed up at 330 by that time i had looked at truck and found there was very little left of the inner rockers they where frinking gone ... so i asked him why he lied about the cab being rust free? he said it is . the outer rockers are rust free, i said did you look under the truck?? he said oh NO i didnt look, im like i WASTED my time and fuel to look at a rusted out POS. i wanted to tell him what i really thought of him ,,,but i held back. so 665 in miles and $225 in fuel all because he was to lazy to look under the truck.