It's certainly an interesting concept. I remember it was discussed or suggested some time ago so it's not out of the blue.
This trend with bolt on sales is normal everywhere now, think micro transactions in games to unlock content that is already there.
I know we're all stuck in the past, here using old computers but for a business to be sustainable they need to look to the future. As a product the base model is very cheap, for someone starting out. Then they can upgrade easily if they want more performance. Skip that jump from a ram board to accelerator most people make after a few months.