The CVAR that is typically adjusted for this is mp_startmoney <X>. You can adjust the variable all the way up to 16K. Most likely that is what Zero did already. Unfortunately, eventhough this variable is in the "round" CVARs it states it will accomplish this when the player resets. So, this only occurs when a player enters onto the server. There is a add-on from Eventscripts that can be used or a plug-in from Sourcemod. At least that is what I got stuck doing when I needed to adjust this. Just type something like "16K CS:S Mod" in Google and you will find some options...