I think you're getting downvoted because what you're saying doesn't match up with the wiki article you linked.

The original estimate was for $1.6 billion, in I'm guessing the 90s, and the estimate had been updated to $5 billion by the time it was formally confirmed for construction.

> The telescope was originally estimated to cost US$1.6 billion,[102] but the cost estimate grew throughout the early development and had reached about US$5 billion by the time the mission was formally confirmed for construction start in 2008.

So yes, it has been over budget, but by 2x-3x, not 20x, and that isn't adjusted for inflation.

Also, everything is just a money pit until it's launched/finished/etc.