I recently noticed what I believe is an unethical trend by several merchants within Commission Junction. They create several links and then without notice make some of the links "non-commissionable". The links still go to the merchant's pages but the affiliate no longer gets commissions for the links, nor do they show up in the "invalid links report".

Has anyone else noticed this?

I have seen this and therefore stick to using only the main link and then carefully monitor my stats on daily basis.

Merchants can be dishonest and sneaky if not held accountable by affiliates and the networks.