I'm quite confident the Wii U was sold at a loss, and I had heard the Gamecube was as well, but I could have been misinformed. It looks like the Switch will not be sold at a loss, so yeah, my bad.
I was mentioning accessories specifically for at home consoles becoming appealing again. Sure there are accessories for Playstaion, Xbox, and Nintendo consoles, but that doesn't mean they are widely purchased. That's me making an assumption though. The 3DS and the DS of course had appealing accessories since you wanted to travel with lots of pieces, but that isn't necessarily needed for a console you plug into your TV. If the console you plug into your TV is also portable then it makes the portable accessories appealing again. I may want a bag or carrying case for my at home console for the first time ever, not to mention a screen protector.
That being said, good point about the accessories being third party. I have no idea how or if money is made by Nintendo from those products, but I would assume so.