The same email might not be counted as a new signup. Users register new user names who have either lost the password to their old name or have 'burnt' their last free name. Payed In customers will sometimes just want to change their name to avoid models (from their pasts).
This might be the case if sales are stable or concurrent with previous patterns and levels.
You should make a few buys with the same credit card and the same IP or email and a new user name -- using trackable (traceable) affiliate links -- and see how this is accounted for.
This applies for ALL affiliate programs.
Slippage of accounts referred by affiliates is a big profit center for all sponsors.
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