There are a couple of problemsI have with a points system.
For 1 thing, hypothetically, if there was a player who for some reason could only attend every second or third tourney due to a good reason, but won every single tourney he came to, he would be at a severe disadvantage and despite clearly being the best, he would not be shown as such.
Another thing is, if someown were say, playign with a broken hand, we as the PR panel would be like "well, they were playing with a broken hand, so we should cut them some slack", but again, a points system would **** them for that tourney.
Also we can take into consideration much more carefull y an up and coming player's victory over a skilled veteran and recognise that. Even if an up and comer comes close to beating a top player we can be like "wow, hey really played well", which could have us see them in a different light.
EDIT: Also, with our scene's inconsistant player base, something like this would be annoying to manage. "Oh the last tourney had 5 new people and 5 people seem to have quit the scene. HMMMMMMMMMMMMMMM!!!!"