Yeah, I have around 100k, it's just that anyone past 50k wouldn't show up on the leaderboards. 

It's infinite. Some players have passed beyond 100,000 points and some maybe even 200,000. The Skill system changed again in the last update (although not mentioned but obvious from experience), which rewards about 50 to 70 Skill for just about every Team Deathmatch game, making it effortlessly easy to gain Skill.

Thanks both of you! :)