And just how many of these type of pictures have you worked on that you know so much about what they "should" cost? Or how they work? Or how many people are involved in each department and why? It's very easy to look at things from one's own personal perspective, but unless you've actually been involved in a large studio picture, the chances that you actually know what you're talking about, or really understand how the budgets get to where they do, or where that money comes from, or where it goes, are very, very slim. It's very easy to criticize what one doesn't understand, and let's face it, film studios are an easy target. But if you don't have any experience with that end of the industry, well, it's easy for anyone to say what something "should" be if they don't actually have direct knowledge of what it is. You use Robert Rodriguez' pictures as an example, but if one wants to compare the visual quality of, say, "Spy Kids 3D" with, say, "Pirates 4", I don't think you can make a meaningful comparison. The cost of attracting A-list talent is part of the business of making large pictures that distributors will respond to, and the money that you're referring to does end up on the screen in many, many pictures. Whether you like them or not is, of course, always up to you. But your criticism sounds like it's coming from a place of inexperience rather than reality. I can say something like "gas shouldn't cost more than $1.50 a gallon," but that doesn't mean that it's true because I know nothing about what it actually costs to refine, store, distribute, and dispense a gallon of gas, let alone purchase the crude, and operate the gas station.
It's a good point you make. I don't have much experience in big-budget films. But that's kind of what makes my point-of-view more valid... it usually takes an outside looking in to see the problems. It's just like being in a relationship... you can never see it for what it is because you're emotionally attached... and then when your friends try to give you advice (because they have an outside perspective) most people ignore it or shut them down completely with a response like "what do you know? You're not even in a relationship yourself!" ... Completely missing the point.
Gas prices are not a good analogy. Gas is refined from oil, deep in the ground, and it's a limited resource. The movie industry is based on intangible ideas and creativity. It can be as simple or complex as you make it. Obviously, there are movies like the new Spider-man and Pirates that require more than others, but I still believe they're not operating anywhere close to the efficiency they should be.
Again, you're right, my opinions could be way off the mark... but so are the opinions of the people who work on the films. Nobody working on a huge set wants to invalidate their job or admit that it's pointless. I, personally, think that having 15 assistants for every position is a waste of money and time... but you know who doesn't? The assistants. Because they get paid for it. So you can bet that you won't ever here them say "hey Mr. Producer, my job is completely un-needed and wasteful, you could really cut down on production costs be firing me." It's just not going to happen. Do you ever think you're going to hear a Hollywood director or producer admit that the Hollywood system is still based on a business/industry model from the 50's? Nope. Because it will make them look like they don't know what they're doing. You are just never going to get an honest opinion from someone that actually works in the industry. They all just use the "well, you're not a part of it, so you you just don't understand how it works." Which, when you break down the though process one must take to arrive at said statement, is just a psychological defense mechanism of saying "I don't want to invalidate my own personal self worth, so I'm not going to even consider the possibility that a production model that doesn't involve my skill set could be correct." It's just human nature. And it also doesn't help that there are so many people in the industry that have the same thought process that all constantly validate each other. It's going to take well informed "outsiders-looking-in" with talent to create a new production model on their own terms... or the complete bankruptcy and total failure of the industry forcing it to start over from compete scratch.
Here's some good reading on the psychology behind it... http://en.wikipedia.org/wiki/Psychological_egoism