Sadly, it's probably not a good financial decision to offer things outside the norm. It's much easier (and cheaper!) to have a consistent product. If people aren't buying the Linux choice in numbers that make financial sense, they're unlikely to keep producing them.
For better or worse, Linux on the desktop is generally estimated to be between 2% and 4%. Of that percentage, how many are actually paying for a laptop that comes with Linux pre-installed? There's more to it than slapping a Linux distro on it, they also need to ensure it all functions with that distro, provide support for that setup, etc...
I wonder if maybe they could sell them with no OS - and no software support, just supporting (warrantying, actually) the hardware? Then, they could just pull 'em off the production line as needed, with a handful already prepped that way to sit in warehouses.
It's just a sad reality, I suppose. With just 4% of the desktop market, how many people even consider buying a product with Linux pre-installed? Judging by the questions we get, I'd expect that to be not much more than a rounding error. I suspect it's a pretty tiny number of people.
The last time I bought a laptop with Linux on it, I spent out the butt on a 'mobile workstation'. It was a very, very good computer - but it was REALLY expensive, as far as these things go.
Configure and price one of these:
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