I might just be confused but what di you mean by skill points?
As well as getting a skill point (used for healing, utility and elite skills) can be gained from leveling and skill point challenges, but also once you reach 80 your xp bar will continue to go up and each time it reaches the end you will gain another skill point but still stay at 80 and gain no other benefits. So you have an unlimited supply of skill points at 80 by just gaining more exp.
The mystic forge vendor sells several items that you buy using your skill points, but because there is an unlimited amount there is no real need to save them and skip out on utility skills.