Lucas thought ESB should have been made worse for less money. He got his way the next time around.
I highly doubt he thought that. I see you are completely detached from reality like the guy in the other thread (http://originaltrilogy.com/post/id/1050968). Budget/time constraints are there for a reason - not to bankrupt. He most likely wanted to make as good film as possible within the given budget/time constraints. For that you need a director who can make great shots in minimum amount of time.
And your statement is especially stupid, considering Lucas put everything he had into the film. The evidence of that is that he had to go to Fox for extra 10 Million after it went over schedule/budget.