Affiliate changes individually and not all of them are the same. I do have a little over 100 affiliates total and not all of them are always active, some of them are more active than others, some of them are not active at all and quit, and some of them just come to life time to time as well. So all in all it doesn't matter how many affiliates you have, eventually you will reach to this level where there are three groups, one who does things all the time, one that is middle ground where they either don't do much but do some or do big but very rarely, and last group that does something for a while but than they leave and never come back.