The "ore should worth more than premium scrap" logic is a bit odd to me, as premium scrap is an end product (used, but still working or fixable parts), while ore is a raw material.
I do not care if Premium Scrap costs 6k or 8k, but the best sellplace's distance should be balanced to the price. Regular ores have to be shipped 5-7 jumps away to sell for highest price. If premium scrap would cost 6k, the selling point should be 3-4 jumps away. Texas-O-Gamma/Alpha is a bit further. And the journey should not contain restricted systems (Alaska for e.g.), as this is not a smuggling commodity.
The problem with scrap mining is that its a solo activity. And even at that quite risk-free since bases are close enough for any Salvager or Golem to make the trip to in complete safety. If there was a bit more risk to it, I would then suggest to make scrap mining just a little bit more profitable than regular trading.