Yeah it is.
If you bet £200 a month (20 x £10) you get £20 off your subs. My mate does this. He just waits until some point in the day when a team is 4-0 up or whatever and the live betting odds have gone to something ridiculously odds on and then sticks on a tenner. He hasn't lost once in the few months he's doing it but never finishes more that a quid or two up for the month.
It pays for his upgrade to HD plus an extra £10 a month. I'm too lazy to do it.
plus zxcvbnm wouldn't approve...