This would be the best solution I think...
All sponsors (AND BILLERS WITH AFF.MANAGEMENT, like CCBill & Verotel) make sure
there's a system in place (in their stats collection) that checks:
1: Domain Referrer (all affiliates must register domains they send traffic from)
2: Join ratio (if exceptionally good, raise flag to look into more deeply)
3: Browser Agent (if "Zango" etc., raise flag to match Aff-ID extra hard with Domain Referrer)
And then, whenever it's seems the true source of a sale can't be determined, send the sale amount into a pool that is distributed among all affiliates, depending on each and everyones normal stats.
If all sponsors does this, the assholes behind all this will see their income dry up.
Not immediately, but pretty damn fast..
I think this is the only way to do it.
This solution also has this benefit: if everyone does this, as an industry-wide solution, no sponsor loses any revenue, and no legitimate affiliate gets any less than what is rightfully theirs. Funds distribution from the pool hits everyone as equally right as possible.