Huntercyril
In France, prices went up a few minutes after launch at each (r)etailer. And I mean real official retailers not 3rd parties trying to sell on retailers platforms. At launch some retailers had an XC3 for 840€, while others had it for 920€. 1h after launch and stock just gone, prices went up to 940€ for an XC3. In case you're wondering, that's almost 1100$ for the lower tier of EVGA cards, while XC3 on EVGA real price is 770€ (just below 900$). All retailers adjusted to around the same inflated prices.
 
You're lucky to have real retailers not inflating the price the same way mines are doing here, I truly don't wish that on you when retailers try to scam you while manufacturers themselves don't increase price whatsoever and retailers just try to make a profit by pinning it on the capitalism, while they just can't assume they are the issue and reason the prices inflates. EVGA prices didn't inflate despite the demand, so why would retailers do ? Because they can, because they want to increase margin and make money. 


To my knowledge, Amazon.fr and EVGA's Store (and maybe Zotac ?) are the only ones not inflating the prices, in France anyway. Can't speak for other countries. 

Huntercyril
Usually, MSRP in France often get the same (or very close) digits for price as US, but in €. 700$ for a Founders Edition was 720€ for example in France, despite 720€ being just below 840$. That counts for any and every product to my knowledge, especially since VAT taxes are more expensive in EU than in US. But that's MSRP prices, and retailers are not obliged to follow them, sadly.
 
To answer your question upfront, yes, sadly, people are not only buying but everyone's rushing onto them. Myself at first bought a XC3 for 840€, then canceled my order when I pressed the retailer for questions and he admitted he didn't even had stock and I could be waiting weeks, so I said screw that, I thought I was paying 840€ (+ shipping !) because it was already on its way and cost more because of fast delivery. But that wasn't the case and like I said, hours after I bought it, the card went up to 940€. I'm very happy with my canceled order because if I'm to wait weeks, I'd rather wait without being screwed and just buy it on EVGA's own store, where for the same price (840€) I could even get the FTW3 Ultra and reward them directly. Plus there's the associate codes discount which lowers the price and can then even mean " free delivery " since it will be around 40€ rebate.

FTW3 Ultra is just shy to 1000€ if you're curious (1163$). Strix around that price too, sometimes even higher by 50€. Still talking retailers real prices. 
 
Not to mention stocks in the EU was / is still very, very low. So retailers jumped on that bandwagon to justify furthermore their pricing.