The Duramatic is not the Sport King. It is an inexpensive gun, made to a price to compete with the Ruger Standard Model. The entire grip frame is made of plastic. That is not necessarily bad, and the many problems with the Duramatic did not arise from the use of plastic. The gun is simple and easy to manufacture, but functioning depends on a delicate balance of recoil spring vs firing pin spring that gets out of whack very quickly. I have tried (note that word) to repair dozens of them, with only limited success.
After H-S went out of business, the design was taken up by Colt, first as the Cadet, then, after they found that trade name was not available, as the Colt .22. Colt gave up on it, and Beretta bought the design. They now market it as the Neos. I have heard nothing bad about that gun, so I assume Beretta's engineers have solved the problems.
If you want an interesting collector's item, it might be worth that money. If you want a good .22 pistol, buy a Ruger.
Jim