Well I suppose so because it just sounds like a bad idea to spend even more money on a sequel to a movie that wasn't just totally loved acrossed the board.
I hate to bring up Spider-Man again but it is a good comparison. Sony spent 150mil on that movie and it had very spotty special effects which I atribute to Sony Image Works not knowing what to do because it was the first time Spidey was done live action. I'm also sure Maguire got payed more than the Routh and they probably over all, spent more on Spider-Man's cast than they did on Superman Returns. And the budget was still 50 million dollars less. Anywho, the point is the movie opened to 114.8mil and had a great for the summer and good for anytime of the year 3.5 multiplier. Now the then record opening was because of the great marketing and the fact that Spidey had never been done on the big screen before, but the legs were because people liked/loved the movie. I don't understand why SR had too cost much more than that, if anything I would think that Spider-Man would cost more because of the reasons mentioned above. Was it harder to make a man fly than to make a man swing around a huge city? Was it more important to make SR look good or make people fall in love with it? People fell in love with Spider-Man, it's just down right strange that people didn't a Superman movie as much as almost everyone thought that they would. WB marketing and the fact that they released it a week before Dead Mans chest did hurt it, but if the movie was IMHO better and more fun than it was, I think that could have overcome that and made around 250 mil in the U.S and about the same amount world wide. Just look at Fantastic Four, it overcame months of bad net buzz (from myself also) and bad reviews and still opened to 56mil and had a decent for the summer 2.75 multiplier and made nearly 155mil and made 330mil overall. Why could a movie with far better reviews and a huge marketing budget only do 60 million more?