A 4K driver is around $40/50 not $10.
Rumours suggested that Sony reduced the BOM to less than $450 for the disc version.
Also, they receive around $36 for every first party digital game priced at $60 and around $10 for every third party game.
You also forget the subscriptions like PS Plus.
And just like the PS4, the BOM will be reduced after a year or so.