Guys,
This one is just waiting for and ready for a clone. There is no good reason for the price of the real thing to be so high. I'll explain why.
Quality scopes cost big money mainly because of the reticle, lens quality, sight adjustment mechanism, nitrogen fill and additional features such as tritium, batteries, etc.
The aimpoint magnifier doesn't have a reticle. It doesn't have any mechanical components for sight adjustment. It is simply a metal tube with a couple of lenses and a nitrogen fill. It is a simple, low magnification telescope without a focus or any other adjustment.
Good, quality lenses used to be expensive to make. They really aren't anymore until you get up to the top 5% for precision style scopes. Lens coatings are common and cheap. Consequently, it wouldn't take much to make a 3x magnifier that would have all the durability of the Aimpoint unit and probably 1/3 the cost.