My experience with traditional bookmakers has been severely limited or closed accounts very quickly. I haven't used a traditional bookmaker for a few years now, betting solely on the exchanges and 90% of the time with Betfair. I do still have a Corals account, which was somewhat un-restricted through leveraging a contact within the company, but I think my max bet is only £200. As I haven't used it for while, I don't like the chances of it staying that way if I started pumping winning bets through it.

There have been various investigations conducted on Betfair prices, and they are usually a few ticks above traditional bookmaker odds. However, the over round on highly liquid Betfair markets is only 1%-2%, whereas a traditional bookmaker is generally significantly higher, more like 110%-120%, depending on the event.

One way to extract the best results from traditional bookmarkers, as far as horse racing is concerned, is to bet with Best Odds Guaranteed. In this scenario, you'll receive a winning payout at the highest price the selection reached, rather than the price at which you struck your bet. This works best in overnight markets, that is placing bets the night before the race. However, this route is also one of the quickest to restriction and closure.