Apart from a red card,what would I get out of joining the C.o.S; What would be in it for me? Anton LaVey stated that he would like to think that the C.o.S as an organization for non-joiners, that being the case why would one join anyway?

This question was answered perfectly by Magister Nemo some time back. Here is the link to his answer.
http://www.satannet.com/lttd/showthreaded.php?Cat=&Board=modCoS&Number=110105&Forum=f38&Words=members&Searchpage=0&Limit=25&Main=110039&Search=true&where=bodysub&Name=2967&daterange=1&newerval=3&newertype=y&olderval=&oldertype=&bodyprev=#Post110105