Let me point out several examples of development stage Biotech companies with No Revenues and No Approved products that were afforded valuations in the BILLIONS
Avexis was a clinical stage biotech company that was purchased Novartis for 8.7 Billion. One patent, one drug in development.
Heres one where Pfizer paid almost a billion in upfront and milestone payments for Therachon using a form of FGF. No revenues, no approved products.