There is always a market for convenience. This part, in this case, would probably not see a return. Injection molding a piece like that would require... at least a 100 thousand dollar investment in the tool alone with multiple side actions and cores required, not to mention the fact that you need at least 4 pieces.

If you only project to sell 10,000 of them, then that's a $10 cost just for the tool. Adding in machine time, material, shipping, assembly... you get the idea... that might be a $40 unit. You could save a little money by going with an aluminum mold base, but not a whole lot, and it wouldn't last more than 100,000 cycles conservatively. It would be about a 20-30% savings in the cost of the tool.

I always find this stuff fun to discuss though.

The thing about this industry is that it is just full of people who would rather design and print it themselves, than buy it at a markup.