There are lots of great people on here, people who have sent me free, yes free, figures for my daughters collection. People who I have bought from at prices that I know are lower than the value of the actual item. They know I am a collector, small time, small items, cheap items. People have helped me find parts for vehicles that I have broke, come up with items I want, because this is about community.
When you bid £10 more than someone else, who seemingly wanted the figure, just to flip it you are going to get shitballed for it. It is of course up to you if you want to ask any price, but this hobby is full of people who monitor every transaction, who know which figures are out there, and if you are making a quick buck this is not the place especially at double your buying price. Put it up on facebook or ebay if you want, but this is more than just a sales page.