Miner ID can only demand Ore. And a Pirate IDed player has no-where to sell the cargo too.
I think the saddest thing I have ever heard was what one guy told me last night. "I have mined for 2 nights and haven't made a credit because of pirates." (As I was pirating him)
Not only did I know that was a bald-faced lie, I'd watched him take the same route again and again after he was pirated, only to run into the same pirate again and again. He never thought to get an escort, change his mining location, change his selling location, or any of the other things that would have helped him save his cargo.
Change things up. I would rather have to hunt down and chase miners then to just watch them fall into my lap. There's no fun in that, although my bank account just loves it.