Typically OEM's are paid per install of crapware (regardless if the user ends up paying for the subscriptions).

It's just a form of marketing for these companies - ie. a certain percentage of potential users will convert into paying users.

The reason Windows laptops have been cheaper or the same price as the linux counterpart is usually due to the combination of subsidized licensing from Microsoft, crapware installation kickbacks, and lower cost of support infrastructure (the OEM already has a huge Windows support staff and infrastructure, creating a new one for Linux - or more correctly, a specific distro of linux - costs more).

If the linux laptops sell more and more, eventually the support costs will come down to on-par (or lower perhaps... who knows). It's a chicken-and-egg problem, and one that OEM's are not willing to foot the bill up front for. We have to vote with our wallets and take that short-term hit in order to push the ecosystem in that direction.