I don't know how long Magic has been doing this, but Star Wars CCG has been doing this for a long time (12 years?). Basically, you would have a tournament or series of tourneys (League) with the set point values in place. You still get 3 points for a win, but the extra points get added on. The person with the most points at the end of the tournament (or league) wins.
I do think some of the ones you have are really too easy. But that's my opinion...
Eric "Neat idea" Largent