and then, how many would they sell? Doesn't sound like a money making venture to me.
There have been a couple serious attempts at plastic squirtboats. The EuroKayaks Enigma and Axis. Some liked them, but most didn't.
Prijon plastic is tough, but still flexes a lot. They also have a tough time with complex shapes, like cockpit rims. Imagine the trouble they would get into trying to mold a convoluted cockpit rim as is standard on squirtboats and is necessary to reduce volume.
At 230 lbs, my XXX rides with front and rear decks submerged, yet, the volume around the center of the boat is still huge as compared to an actual squirtboat. It just ain't the same thing.
If I were rich, I'd have custom glass playboats built. There's nothing quite like paddling glass.