Jim... we rarely get more than a couple replies to the newsletters we send out, unless we say something really stupid or stick in some bad urls.
I see that about 10% of our affiliate emails go bad within the first 90 days after signup. Seems that some people either don't last long in the biz or maybe don't really care about getting mailings. Around 20% will go bad after a year. Usually those are never the top producers. Funny how that works.
Simon