Comment by firejake308

> Celgene said it spent $800 million to develop Revlimid and spent several hundred million more on additional trials to study the use of the drug in other cancers. Those combined figures represent about 2% to 3% of Revlimid sales through 2018.

These guys are making 300% ROI in annual revenue from their one-time investment into R&D. In order for that to be fair (in line with your 20% average ROI target), they would need to be testing 15 new drugs per year, and if all of the others had failed, then it would be fair to markup the one that succeeded by this amount. But according to the Wikipedia page, the company has investigated less than 10 drugs in their entire existence, much less 15 drugs per year.