I think the biggest problem is that many consumers just don't want to do their homework. With a little research they would be better informed. With the internet it's so easy these days to type in the product and find reviews and forums all over the place. It's easier than ever to make a more informed decision.
Then again some people are just lazy. They don't want to run 20 feet of speaker cable to surrounds because it would mean having to do some work. Instead they opt for the easy way out with wireless or whatever.
After all these years it still amazes me how many people believe that their getting all that power for so little money and don't ask themselves how that can be.