You should blame to manager who is accepting copper member on signature campaign. Forum doesn't have business with signature campaign. Manager should not accept anyone who is spammer even they are legendary rank. Isn't there so many legendary spammer ? Sometimes newbie wrote more constructive post than Hero/Legendary. However I don't think many people's using copper membership for signature, if there is manager should choose at least good poster.

But, I think and believe admin could disable signature for copper membership ( likely it will not happen). Copper membership was implemented in order to post with image & some other benefits, (signature campaign wasn't intention of copper membership).