In 1996 when it was a proposed idea the estimated cost was 500 million USD and the proposed launch was 2007. But the design kept getting more and more lofty and the project got more and more complex. The initial estimate was a bit off, it has cost about 9.6 billion USD so far.
Still though, if everything works and we learn more about the universe, I think it'll have been worth it.
There was a thread on here a while back where people would set up cameras and be able to make a motion image showing what parts moved with a regular frequency. Was being used at factories to determine points of failure via vibration. Can't find the thread now though.
"htmx is small (~10k min.gz'd)"
Maybe I'm crazy, but that sounds huge based on the list of features in the docs. Would be interesting to see a breakdown of the features and how much of that size they take up.
Still though, if everything works and we learn more about the universe, I think it'll have been worth it.