One should really note that Gush decks have not shown a win rate substantially higher than 50% in all of 2016. It seems a bit silly to go ranting and raving on about how they are this dominant force without having actual statistics to provide even a sliver of correlation here.
If anything shops was the one delivering 60%+ match win performances.
@desolutionist I'd imagine the biggest problem here is going to be that most goods are either reproducible or at least able to be copied by another company without too much effort.
The only examples I can think off on top of my head are Stradivari (and to some extend other vintage instruments), which are funnily overvalued on a consistent basis much akin to magic cards after a buyout and valuable art.
While the former is not necessarily being bought out supply is short enough that the market is essentially cornered, still a lot of them don't reach the desired price at auctions since their alleged value has inflated to a point which even people rich enough to be in the market for this kind of thing can't or won't meet.
The latter however appears to be in a bubble much akin to MtG but for different reasons. Insane demand driven mostly by lack of stable investment options and the desire to own something that's a limited quantity as well as a plethora of soft qualities have driven prices to almost unimaginable heights which surely won't continue in the long term.
You can make the same argument towards shop decks not really trying to spec specifically for gush decks as well though. It feels to me as if many shops pilots jam the same cards into their deck and insist that the format is steered in a way that allows them to beat the most prevalent decks. When TKS/Eldrazi started to become popular it coincided with a huge, temporary boost to their win rate. Mostly because the best gush lists were those that essentially preboarded for the mirror. Now that they have shifted in their approach the same old, stale shops lists proceed to lose more.
Not actually that surprising.