I have never bought, and will not buy a raspi.
I dislike their marketing hype and lack of openness and their broadcom connections, which is a company very hostile to hobbyists and tinkerers.
And what does the Raspi offerer that the others don't?
If I compare it with for example Olimex. Olimex has full schematics and PCB layout made available via git repositories. It will be tough if you think you can make the olinuxino's for a lower price then they do themselves, but having the complete KiCad projects available has a great educational value for PCB design,and it is a good start and timesaver if you want to extend such a board with added custom hardware.
Olimex also sells the microprocessors and other parts for custom boards. Now go try to buy a handfull of processors used on the raspi boards.
Hardkernel is another manufacturer of small Linux boards, and they make and sell a lot of different variants with Exynoss, AMLOGIC and RockChip processors.
Friendlyarm has been manufacturing linux capable PCB's from before Raspi existed. The early beaglebones were also already there. But those were marketed at mostly industrial applications and as a test bed as pre-cursor for industrial applications.
So the only "new" thing that raspi brought to the market was a price cut, at the price of vendor lock-in, smoothed over by deceiving marketing tactics. Their first promise was a GBP25 computer (Or was it GBP20?), upon which they never delivered, but it started the hype and blind followers that are now apparently not even able to see the other boards on the market. Maybe they sold a handful of products at their promised price, but with so small memory that it could hardly run any program. It was also timed "just right" Processors had been getting more powerful and prices were ever falling, and even if raspi would never have existed, there would be a similar product for a similar price one or two years later.
Another thing I don't like about raspi is the way they further tempt customers by placing drm in the camera's they sell, so they don't work with other hardware.
Yet another reason why I don't like raspi much is because they held on to a 32 bit OS when the whole world was shifting to 64 bit. That must have resulted in countless hours of time wasted for developers in compatibility for both versions.
A lot of the other manufacturers also have on-board eMMC (or on a breakout board with a connector), while the raspi requires an additional uSD card which is not factored into the price, and this makes the price difference also less. Add to that the improved reliability and speed of eMMC and you start wondering why uSD is even used as a primary storage device for an OS.
The article linked to from the first post hints at more raspi's being used in industrial applications, while their products are probably not suitable for that. Things like extended temperature range for chips, underfill and conformal coatings to make PCB more reliable for industrial applications do cost a bit extra. Using an uSD for the OS in an industrial application? Really?
"healthy competition" should be the foundation of a free market but at the same time it's what manufacturers are afraid of, and most manurefacturers try to thwart this by building senseless walls which are only an annoying hindrance to consumers, and they don't even realize this.