Because just keeping the economy going is advancing society. It’s the base that keeps all of the researchers fed, clothed, warmed, etc. Anyone contributing to keeping that functioning is critical.
The only people who don’t care about the economy are ones who haven’t lived through a truly bad one.
It’s not some thing that just happens in a vacuum to make people rich. It’s what drives 99% of the production of all goods and services in the US. The endowments for all of our top research universities depend on the economy, etc etc.
You call it “just a business transaction”, but employing 60k people with good paying jobs in a financially sustainable way is incredible because it means they are producing more than the value of all of those salaries to the wider society. Producing a surplus is how we advance.
You can argue that some businesses are leeches because externalities or whatever, but that can be fixed with taxation. When it comes down to it we need to operate at break even or a surplus as a society or we are fucked.