I'm curious if you'll reread your comment and can see how you disproved your own point.
And by upsell I just mean convincing you the financial burden is worth the proposed extra treatment. Right now as long as I have health insurance I don't care abut the extra cost of extra treatments beyond a health check because I don't directly bear the cost.
I mean pretty much every other health related thing that's not covered by insurance has the same dynamics; eye care, cosmetic surgery.