why do i waste my time on CF

as the title says, plz can some1 answer my question, i used to play MMORPGs, they helped me by their trading system and the skills system, like combining skills to take the least dmg and buying and selling, and i even noticed how they helped me, but i cant think of anything that MMOFPS games helped me with, if no1 can answer my question with a decent answer, i will get back to MMORPGs
i used to play:
9dragons
Aika
DOTA
Metin
Perfect world
conquer online
Fantasy earth zero - this game was the best

i never reached any high lvl in any of these games, but i pretty much know alot about them except conquer and DOTA
so can some1 plz answer my question