The whole reason why the business model works....is being good at understanding the value of items on the used market.
It's not as though I'm picking these up for £500 and trying to flip them for an extra £1000. Similar packages fetch similar amounts in places all over Europe and the USA. The buyers decide the market for these.
Okay, you ask someone to custom machine, or cheaper still, stamp these items out of steel. I'm sure it will be far cheaper than even paying for the ever increasing Groza prices.