I think a lot of yanks invested in English football without doing due diligence as to why owning an English football club is not a paticularly attractive investment if you want to make a return on said investment without selling.
Like you I don't follow Yankee sports, but I read or saw a news item a few weeks ago about one of the big American clubs (AF I think) selling for an absolute fortune, 6 or 7 billion i think.
Their revenue was much the same as a United or a Liverpool, but because of the way American leagues are set up, a revenue of 600 million would mean an operating profit of 2 to 300 million.*
Whereas United lost money with similar incomes over the last few years (even without the scumbags pilfering IIRC)
*if anyone knows the deal I'm talking about, please mention it.