Before I say any of this let me make two things clear. 1) Money does not correspond 1:1 to quality. There are so many factors that go into this: manufacturing location, marketing, direct vs retail, perceived value, etc. 2) Diminishing returns are true of just about everything.

Have you ever heard people say you should spend the majority of your budget on speakers? The reason is that no matter how good your electronics are if the speakers can’t reproduce the difference then it doesn’t matter. The 800fs are excellent speakers but they are less than the cost of the MK5. It is possible that the 800fs simply can’t reveal the difference. To me the 800fs are at the top of the consumer market verging on audiophile. These types of speakers are designed like most consumer speakers. They sound pretty good with most gear so that consumers think “wow these sound good I wonder what the next step up sounds like”? One of the giveaways is the frequency response. The 800fs have a deeper frequency response than the 80fs which are the next step up in the Paradigm range. Why would the cheaper speakers have a deeper response? Because the average consumer associates good sound with deep bass. The problem is there is always a tradeoffs with physics. You only have so much surface area moving air. You can either have more low end or more accurate low end (I know this is an oversimplification but generally true). Audiophile speakers value accuracy over exaggerated sound meant to impress on first listen.