why wasn't there a sequel?

Because it didn't make enough money to justify producing a sequel, just like "John Carter."

Show business is all about the bottom line, after all.

Because the movie totally bombed at the box office.

The movie tanked so badly that Bruckheimer had to retreat into TV work to maintain his cocaine pile.

It was pretty good, but the budget was astronomical and the box office reception was weak. Critics didn't get it and theater chains didn't let it run long enough for word of mouth to build.

It failed at the box office.