Price setting agreement I reckon. Either all the stocks come from one source and that source is the one setting the price, or the stocks comes from multiple source, and one store sets a price and the rest follow. In this line of business, if one store breaks that code and go against the rest and set cheaper price, watch as the rest gang up against him and oppress him: either in limiting stocks to him, squeeze him out of minimum order quantity (MOQ) on his next restocking, or other unscrupulous deeds that is equally despicable.
I did my own order of Titan X last time, ordered two from Nvidia's own store and another one from Amazon, both at MSRP price. I was just laughing and shaking my head in disbelief at how much the local stores are pricing their own Titan X stocks and how much premium they take. That's the price local purchasers have to pay when the stocks here had to go through multiple "middle man" and each "middle man" want to make profit for themselves. Once it reaches store shelves, the end price is what you guys end up paying.
Others weigh in local warranty lah, peace of mind if buy local lah, so these "middle man" practices you have to take lah, as bitter pill you guys have to swallow if you want that peace of mind or local warranties (even with "local warranties", your distributors here have to reship back to overseas for RMA, and they will only exchange your RMAed item to a brand new one once they know the defective items is received on the service side overseas, and then only they release their locally available units, or if no local units available, they will ask you to wait until the service center releases invoice for new unit to be delivered to them, and then to you by self collect here) . I dont mind sending my cards up back to Nvidia or Amazon myself, seeing how I've been purchasing online and dealing with RMAs internationally all this while. I've RMAed my own Microsoft Surface Book to Microsoft USA myself, no hassle, just simple shipping back and they reship a brand new unit. Sure, the shipping is substantial, but at least I know my money goes to the right entity (Microsoft, shipping couriers that does fast and reliable service), rather than some shady unknown "middle man" and third parties that eats profits for doing nothing than just being middle men.

i'm sure they set as high as possible since people will still buy initially, later sell like hot cakes