The thought of making a profit sounds pretty good right now with money like the rarest 50p coin to ever exist previously selling for way more than face value. It's common for rare coins to rack up some extra cash so be sure to always keep an eye on your change.Now we spotted a popular 50p coin sell for a good load of money on eBay – and you could have one in your pocket. In recent years, eBay has become a common place to sell rare coins, although the 'sold' listings can paint you a better picture on realistic…