Originally Posted by El Payaso
Notice that people don't care about budgets, they just go and see the movie.
Production companies care VERY much about the gross to budget ratio. Superman Returns required a significantly greater sum of money to get the product they released. Even if you concur with the rumors about it only costing 207M as opposed to 270M, it still doesn't break even with the budget.
Add to the fact that it has not aged well in the public's eye with the mediocre home video sales, and it's not hard to see why it didn't get a sequel, as opposed to BB which was far more profitable and popular on the home video market.