I certainly get what you're saying.
I'm not ready to think of Martinez as a bad guy yet.
I tend to think he's relying on the advice of Boras.
To me it's not much different than if you're trying to sell your house.
You've got an offer in hand for $350,000 but your agent is convinced that if you wait a little longer you'll get an offer for $360,000 or $375,000. The agent has a good track record of being right. What do you do?
Most people would probably listen to the agent. They wouldn't want to kick themselves later for getting less money for the house than they could have.
I think there's a fine line between greed and just wanting to get the best deal you can. Maybe it's just human nature.