Player worth is weird. A 0/0 gave me a "slot_troop_crpg_kd_ratio" of 9476 (then it's divided by 100), while my 64k/17k main gave me a kd of around 22,000. In the end, my guy was worth 1233 and the 0/0 STF was around the 900 range with -1/1 because of spectator.
It uses your level, that weird ratio, and your current kills minus deaths on the server. As long as your performance on the site is decent and you're a high level, a large variable factor seems to be your short term performance on a map.