Why wait? First, the price of 500 is not what PI charged when it came out so that's not really an accurate comparison. When it was released, unless you got very lucky, it was north of 600 bucks. Next, the company that made it closed up and restarted under a new name, becuase they had so many quality control issues even authorized dealers would no longer carry stock. Pretty good reasons. As for diecast..that's not a big selling point. At least for me. It's 1940s technology that some marketing guy has turned around to make it cool again. Tonka toys where diecast. Diecast was used on some lines in the 80s. To me this is 3D all over. The TV tech that started in the 40s and makes a comeback every 15-20 years when a new group of people are around. It's not a big upside. Especially in a 1/4 scale. It's like being happy your statue is concrete. Being heavier is not something I ever thought would be a selling point. Crazy.
It's great your figure is fine and you enjoy it. But there are tons of reasons why people would go for hot toys over PI.