I don't think a CS:S section is needed . First of all there are not enough posts related to CS:S so it's not a very popular game in this community . Second , it's not an MMORPG ( I know that WarRock and some other games that have their own section are not too but as you can see the activity in that sections is good enough so they deserve it ) . Third , since it's one of the most popular FPS there will be lots of spams ( in my opinion ) . Forth , this is a mostly a hacking community as you can see ; related to this , the CS / CS:S (some) hacks can be found on google or for sale from other guys ...
Thats my opinion , I don't know about the others