But isn't that like saying, "Why do we even grow avocados? They rot so quickly and are so hard to grow. Apples are just as delicious as avocados and more people like apples than like avocados, so we should let avocados go extinct and just grow more apples instead."
You've named three wooden roller coasters that are infamous for their roughness, but not all wooden roller coasters age poorly. They DO require more upkeep and care than steel ones. But they continue to be built, rehabilitated, and reborn today precisely because they have a place. Steel and wooden roller coasters are compliments to one another in my mind. Have you ridden The Beast? The same ride made out of steel would be horribly boring – long, flat straightaways hugging hillsides. The fact that the ride is wooden gives it personality.
Just as wooden coasters can't do what a steel coaster does, a steel coaster can't do the things that a wooden one can.