>>lovepa+(OP)
Given that over 750 people have signed the letter, it's safe to assume that their motivations vary. Some might be motivated by the financial aspects, some might be motivated by Sam's leadership (like considering Sam as a friend who needs support). Some might fervently believe that their work is crucial for the advancement of humanity and that any changes would just hinder their progress. And some might have just caved in to peer pressure.