Well, in regards to the amps, Made In America does cost more, but there can be some value in it, given that good amps are pieces that can typically last 20+ years. Just looking at the inside of said amps compared to any typical consumer grade receiver or amp, you can see big differences.

The reality is that the market is somewhat small, and most people don't care much except for price. Of course you probably get what you pay for, and rated power for consumer level products is likely far less than Outlaw products (I can't really think of a "name brand" that makes products with "real output power" at lower prices).

Digital decoding is another story, but it has more to do with the computer market and nearly almost all Asian development work.