This is a hard thing to address, because we want there to be a sort skill and deserved-points-system, but also encourage less experienced sparrers to want to try out sparring. There have been ideas about implementing rooms specified for sparrers with certain rations/spar wins so that the noob-chasers, who are positive from boosting noobs, will be forced to spar others with similar ratios, and that newer sparrers may build their skills against others without much trouble.
I like this idea because it may solve the noob-chaser problem, and may allow less experienced sparrers to want to spar again.
As for the point system that you mentioned, it can be difficult to implement. There are a few problems, and I think Areo described those problems very well. Void's idea of not losing points if ratios between two individuals is similar and losing a bunch against someone with a dissimilar ratio is probably the best way to go. Beating people with better ratios should be rewarding.
The only problem with this are those people on alt/noob accounts with less wins beating someone on their main. The person on their main, who could be 10k-4k, could lose to someone with 400-90. The 10k-4k person could lose a bunch of points because of how many wins the 400-90 person has, even though the 400-90 guy is actually good. Because of his ratio, he'll be getting a lot of points, and the other guy will be losing a bunch of points, even though their skills could be similar.
I like the idea of having rooms for people with different wins, so that we may allow less experienced people to spar in rooms without hindrance from noob-chasers. There would be a room or rooms for players with better ratios/wins, and those players would NOT be able to enter the lower rooms.
I think it would be fine if players from the lower rooms had the option of sparring in the higher rooms. They're less-experienced, and they may get rekt anyway, and they can at least try it out and figure out which room they belong in. If there were some kind of point system, players with ratios that fit the higher rooms will not get points from beating people with ratios that would fit in lower rooms.
The argument to specific rooms for specific spar wins is that there will be less people in certain rooms to spar. The main problem is just activity in the arena. If we get more people to spar and compete, we won't have this kind of problem, and every room will be packed with people who are going for the same things whether that be wins, points, respect, you name it.