In general, the feds have been looking closely at C&R licensees who buy in quantity and sell many/most of their purchases to NON-licensees.
The C&R License was intended to allow real collectors to swap and trade with each other without going through dealers. It was not intended to alllow a "collector" to buy hundreds of guns to sell to the public, arming the deer hunters (or street gangs) in a 50 mile radius.
If collectors work within the spirit and intent of the law, things will be OK. But if too many of those rifles bought by the case turn up in the wrong hands, it could mean goodbye to the C&R designation.