That should be obvious, if the mid range cards have all gone up in price then the retail value of the cards above it are forced up as well. The other week we were almost in the ridiculous situation where a 1070 was almost at 1080 prices. Market segmentation is still required so retailers will make sure that each card is priced accordingly.
But this is not strictly true, nearly all of our 1080Ti are actually lower in the price, the mining situation though is impacting pricing on 1080Ti elsewhere, has not impacted the prices of 1080Ti at OcUK. As I've said our pricing on them is quite aggressive, especially considering they now cost us more to buy due to the them going up in price due to memory price increases.