It's simple. They aren't worth as much now as they were when they came out. Newer stuff with more features is out now, so the consumers want the competitors' products more or even want Futaba's newer items more. When it was the hot new thing they could get more for it and so they did. That made it worthwhile to invest in the R&D to make a reliable 2.4ghz receiver, unlike Spektrum in the early days. Now it's worth less, so they sell it for less.