Sony has this tendency to sell overpriced hardware. Could it be that nobody was buying Sony's SD cards?
I mean it's a nice guess, but back in reality land a quick google search could have shown that they are price competitive with other CFexpress cards in their class. Yeah you'll find cheaper, but pair that with slower.
Yeah, but approximately nobody uses CFExpress. It was an attempt by the CompactFlash folks to stay relevant after the SD card standard ate their lunch. No still camera I've never owned, nor any camcorders (including fairly high-end 4K gear from major manufacturers) uses it. Everybody uses SD. Even most cinema cameras (which as far as I'm aware, are approximately the only gear that *ever* used CFExpress) mostly use SD cards now, or else have removable backs with SATA SSDs or similar.
Put another way, today I learned that somebody still actually made CFExpress cards. I thought the standard was thoroughly and completely stillborn. This is a tiny niche of a niche. And saying that Sony is price-comparable on something that is so niche that it is compatible with only maybe a dozen cinema camera models built by two or three companies within a narrow range of years doesn't exactly contradict what I said about suspecting that nobody uses them because of the cost. I doubt any other CFExpress cards are affordable, either, because economies of scale basically don't exist for a product that's so low-volume.
Many people need memory cards that actually meet performance criteria. For "nobody buying them" they certainly had a very complete product catalogue spanning many different types, mid end to the high end, from last decades capacity, to current cutting edge.
When I go to buy SD cards — and yes, at this point, almost everybody uses SD cards — I'm not even looking at products made by Sony. I'm looking at products by SanDisk and Lexar. I would be okay with Kingston or Transcend in a pinch. I guess some folks also like Samsung, though I've been burned by other Samsung gear often enough that I don't trust them with something critical like an SD card. Sony isn't even on my list. And pretty much every photographer and videographer I know does the same.
Given that Sony screwed around for more than a decade with their own proprietary "Memory Stick" format, they basically missed the market for SD cards, and other companies claimed that market.
Based on that, at least in my mind, I kind of assume that the people who buy Sony flash cards are probably the ones who have always bought Sony, because it's the only name they know and trust. Most of those folks probably started on Sony back in the 1970s when their products were actually built to last for decades, were top-tier in features, rather than being hobbled by pressure from their entertainment division, and when repair parts weren't priced so high that a power switch costs more than a whole new camcorder (not kidding). They're probably the ones who used to buy overpriced Sony headphones for $150 that fell apart instead of the $50 Koss headphones that didn't. They're also probably the ones who still have analog land line home phones, and most of them are probably retired or dead by now.
*Maybe* some of their mirrorless camera purchasers from the last few years buy Sony cards out of some bizarre sense of brand loyalty, but I'd imagine most of them talk to other photographers and ask what to buy, and again, I'm pretty sure Sony won't be on anybody's list.
I'm just struggling to imagine them having much of a market except perhaps in niche products like CFExpress or in cheap CF cards sold at Walgreens or CVS for high margins to people who don't know any better.
But maybe I'm wrong.
If no one was buying them then they would consolidate their product line, not cancel every possible related storage device type. Your theory doesn't just fail occam's razor, it fails the drunken pub test. It makes no sense.
No, they would only consolidate their product line if they thought that doing so would make it more profitable. That would require a high enough volume of sales to matter. Companies don't usually cut entire swaths of products because of the price point. They usually do it because the product line makes so little money that it isn't worth the extra effort to keep it going.