So that when they want more research done, companies do not reply with: "you screwed us last time, NO THNX BYE" Basically the same reason that "I changed the d

So that when they want more research done, companies do not reply with: "you screwed us last time, NO THNX BYE" Basically the same reason that "I changed the deal, pray i do not change it further" is a strategy that works at most once.