Same with all things, just because its the most expensive, doesn't make it the best thing! Prime example is: look at the 06-09 range rover, its msrp was over 60k and those things spent 75% of the time in the shop getting repaired!
and that's why people would get rid of them and otherwise we able to buy them for cheaper!
A good product is actually determined by the demand of the item, you can spend a lot money on an item and have either low and or high sales just as much as you can have spent lil money on an item and still get low and or high demand. The issue always is whether or not the item is high demand and for the price it costs.
Another example is KIA, they used to be cheap car cheaply made with low demand... After they spent some time in improving their rep up and still maintain affordability while giving you options that other overpriced vehicles wouldn't unless you paid 3-5k more in those options. This is why reviews are needed and helpful as opposed to personal opinions.
What if this exhaust would be .5hp less than say akra... Wouldn't you buy it even tho you know that It's only that much less but performs that much more with just a 1/3 of the price? This where personal opinion, brand-ing and show off in the form of I have the most expensive xxx item come into place.
To me, it makes no difference as long as I get what I want and currently I have so no complaints from me!