I think the system is set up that way so that the points could be given somewhat anonymously so that there would be no retribution for negative feedback.
Ive asked about implementing a 'Thanks' type system here that Ive seen on some of the Linux forums I frequent, but of course, it has stalled. Its a bit more generic in that it only records how many times you have thanked someone for their help and how many times someone has thanked you for your help. To me its a much easier system to use and more telling of your participation on the forums while still maintaining anonymity.
But I suppose, for now, we'll remain stagnant.