I think these ARM chips are more expensive than we realize! Apple's egregiously high upgrade pricing on MacBooks sucks, and 8gb of RAM by default on the base model sucks as well, but it is likely to raise the average sale price of devices equipped with their chips. This has been known for some time, I feel.
I'll cut Samsung some slack since we don't know the unit cost of the Snapdragon chips, and they aren't likely to sell out of these devices right away even with competitive pricing because of the state of Windows on ARM. I'm excited to see how Linux support pans out on the next generation of non-Apple ARM notebooks, though; I think this is a chance for some manufacturers to take Linux more seriously, as Linux on ARM is actually not a terrible experience.