I have never failed to sell a car on pistonheads within a week , but then it depends on car type .
do your homework and sell for a realistic market value , forget the 10k you spent on mods as they mean very little in most cases despite what CS will argue ,and you will sell .
put it this way , i sold our mint 205gti for 100% profit after 4 years of owning it in 24hrs , and sold our sport 160 elise , for 200 quid less than the dealer advertised prices of the other 2 that were for sale in 48hrs ...
but then sales is my job , and trust me i wouldn't want to sell cars full time , let alone wanting to sell for profit .
although those that i personally know who do have a very nice lifestyle , and houses .