Why do dermatologists "prescribe" such expensive skincare products (or have expensive skincare lines that they recommend to their patients)? [Misc]

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I recently visited a dermatologist who, after seeing my skin (severe acne), recommended products from the skinceuticals. The total price for the 3 serums + derma roller that she recommended came to almost $800.00.However, I felt like this was a huge mark up. The derma roller she recommended was almost $150.00 (when I have seen them for way cheaper on Amazon). And this is something I have noticed at most dermatology clinics where they have ridiculously expensive skincare products. He also never prescribed me anything like Retin-A, tretinoin,However, whenever I come on reddit, I always see testimonials (and I can also attest) to people having good results w/ the ordinary, K-beauty, drunk elephant etc. I know some of these might be expensive, but one serum at my dermatologist's office was $200.00I was wondering why dermatologists carry such expensive products in their office? Are they worth buying?I guess I feel bad for questioning the motives of selling such products since I know dermatologists have spent years studying skincare science, but the price is still steep.
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Submitted by silentintroduction1