Ah, I get it.I think you misunderstood my post. I said that I thought most people would buy a used earlier model of a high end matrix instead of buying a new PMR. That's why i'd imagine they're getting poor sales. It's a case of, "Oh, I haven't got enough money for the latest marker, so i'll run this one until i need spares or buy a similar older marker".
They're being outcompeted by the second hand market and the longevity of their own products, and I'm guessing that demand for £300-£500 markers has dropped so low that they're not bothering to produce them any more.