Yes, people get "gubbed" all the time, this is when they catch on and either close your account or restrict you to silly little bets like 50p and remove any promotions from your account. It helps to "mug bet" which means betting on the things an average mug would bet on, so pick a football team and bet every time they play for example. Lay the bet off at an exchange so it only costs you a few pence a go. The idea is to make your promotion bets look like random gambling bets, ie. put the money on and hope.
As for losing, the only way you can really lose is if you screw up, which is easily done. You need to be extremely careful when placing your bets, especially on sports where the odds change a lot as you may place a lay bet at x odds and the exchange changes the odds to y, which means your bet isn't laid. If you lose at the bookie, that money's gone.
As for losing, the only way you can really lose is if you screw up, which is easily done. You need to be extremely careful when placing your bets, especially on sports where the odds change a lot as you may place a lay bet at x odds and the exchange changes the odds to y, which means your bet isn't laid. If you lose at the bookie, that money's gone.