The problem here are not the retailers but Nintendo who is giving the MSRP. Even charging 50 bucks would be too much. You can charge 50 bucks when you offer real new content. A new world, a new storyline as an example (or featuring previously released DLC, Disgaea 5 featured all released DLC from the expensive Season Pass, even the Royal Edition of Final Fantasy XV with brand new content and the Season Pass was now released for 50 bucks). If it is a straight port with minor improvements, we are on the 40 bucks side. But hilariously enough, they charge even 60 here so I‘m completely out.
Nintendo is showing their greedy face here. Going back to a failed hardware, porting one of it‘s games with zero efforts to a new, popular console and make it even more expensive than it was when it was released as a new title a few years back.
Sony was a good example with the Shadow of the Colossus remake. Many retailers including many Amazon branches sold the game for just 30 bucks at launch, this was 10 bucks less compared to Sonys MSRP.