1. If a certain sports outcome (e.g., beating a rival, league championship, etc.) will lead to an increase in alumni donations, then it might be considered prudent to invest some money into that program.
2. Title ix creates weird incentive structures for athletic programs, with a default assumption being that the university is guilty of discrimination if there isn’t a lot of equal treatment for all sports (both men and women). Note that this has helped funding for women’s sports a lot (the disparity was almost comical in the 80s and prior), but it has also led to the elimination of some fringe men’s varsity sports (some of which became clubs).
Because everyone else you're competing against is taking it seriously.
Please try to step back and understand why people take it seriously and truly care about sports. You don't seem to understand and don't seem to be actually trying to understand. It's exhausting trying to have conversations like the OP topic when people come in and degrade high level sports at its core.
People take sports seriously in other countries as well. I took sports seriously. I just didn’t have an expectation of professional facilities for a social sports team in spare time at uni.
If you want to compete at a high level in the US you often need to fulfill that long list of requirements a few posts above, unless it's a very niche sport.
You can also play pickup basketball down the street with nothing more than the court and a ball. There's nothing wrong with that, but don't expect that to convert to any kind of high level play.
It's fine to care about sports. It's fine to devote most of your time to preparation for competition. It's unseemly for institutions dedicated to academics to divert vast funds to non-academic pursuits. Most of the spending on collegiate sport generates tiny performance gains, and since all college teams are spending this money there is something of a Red Queen situation so those tiny performance gains change cumulative results not at all.
Also, for nearly every sport except football and women's basketball, the real talent in the college age group isn't even playing college sports. Sports are meaningful with or without access to the latest most expensive amenities.
That is an easy argument for an outsider to make in virtually any situation. The answer is probably similar to the reason you aren't doing your programming job on an 11" chrome book.
1. If a certain sports outcome (e.g., beating a rival, league championship, etc.) will lead to an increase in alumni donations, then it might be considered prudent to invest some money into that program.
2. Title ix creates weird incentive structures for athletic programs, with a default assumption being that the university is guilty of discrimination if there isn’t a lot of equal treatment for all sports (both men and women). Note that this has helped funding for women’s sports a lot (the disparity was almost comical in the 80s and prior), but it has also led to the elimination of some fringe men’s varsity sports (some of which became clubs).