bid what you're max bid is then dont go back(last minute if you want).
if you get offered second chance just tell the seller what YOU'RE max bid is .
i.e the winner didnt want it at 15,you bid 14 ,you can now have it for 14!
answer,fuck off prick £10 or nowt,you choose
if you think its worth £50 then thats all you are willing to pay regardless of anyone else bidding it up.