There was a time when one good week of Betfair trading was enough for me to start spending money I hadn't made. Not literally, of course, but in my head I was already calculating what would happen if I doubled the stakes, compounded the profits and kept producing the same returns for the next month or year. Give me a particularly good run and I was practically building houses with future profits. Looking back, it sounds ridiculous, but I suspect plenty of traders will recogni