You really have no idea what goes into making a shotgun it seems........and if you think $450 is a lot of money to spend, you need to add another zero. Punmps guns are built like a jack handle - and they handle the same way. Cheap SxS or O/Us also have sewer pipes for barrels with no balance or handling worth a damn - that's why they are so cheap at $450. If you want to be happy with a 200 pump, so be it - have at it and enjoy it.
Quality costs, and the fitting, top-drawer materials, hand finishing, proper heat treatment, etc. all factor into it. Let's not forget $5.00/gallon fuel, dollar/Euro discrepancy, the lack of human hands making a pump compared to a SxS or O/U.
Using your argument, a Ferrari should cost the same as a Chevy. Maybe you should go to a GOOD gun store and handle some decent Spanish SxS guns from AyA, Arrietta, etc., and then compare them to the 2x4 jack handle SxS from Turkey, Russia and Brazil.
Fit, finish, balance and material quality become really evident really quickly