Granted he did a shit load with $150 million, but imagine what he can do with $200 million. This movie had nothing but positive word of mouth...everybody except for the few thousand hardcore transformers fans loved the shit out of it. So the sequel will no doubt make more then the first one.
Or do you think Paramount will just keep it $150 knowing it will make a profit?
How much more robot time would $50 million get us anyways?