Nice article !
Maybe important to say is that you can't do this with bigger amounts since traditional bookmakers will quickly limit your account. I've been keeping an eye on some of the Bitcoin only bookmakers if they aren't fully up to date with their odds, but no real sign so far. Once bookmakers on a blockchain take over betfair with 1.98-1.98 odds it should be heaven for these kind of margin trades. I'm really looking forward to that.
RE: Matched Betting - How Online Bookmakers Give You Free Money