I just took a random sample. 10 affiliates. I spun the dial and hit an affiliate. this is a small sample to be statistically significant I probably needed to do this for 30. I got 3 users who sent traffic 0 sales. 3 who sent sales. and 4 with 0 clicks
so if you define useless as sending 0 sales 70% if you define useless as signing up and not sending traffic then the number is 40%
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