Class C vs Class R

[LizardNecro]

Class R guilds may kill a Class R, Class C, or FFA mob spawned at any time with the following restrictions:

Successfully killing a mob spawned under Class R puts that guild on lockout for that mob's next two class R spawns.

I'm not sure if I am reading this right. It seems to be that a class C guild can participate in class R mobs just as if it were a class R guild. If that is the case, then isn't it best for every guild (no matter how casual they are) to be class C? They get the same stuff as class R, plus get a chance (no matter how low) of hitting class C mobs too.

Am I missing something?