I know from first hand experience that there are licensed replica jerseys. I bought one or two replica NBA jerseys directly from the NBA store. The other pro ball leagues also sell replica jerseys on their sites.
In answer to your question, yes you can sell replica jerseys as long as they licensed replicas and not counterfeit jerseys.
You can go to the NFL website under Shop and see that they sell replica jerseys.
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Non payers should get unpaid item strikes and be added to block bidders lists. Period.