Because most of the Catholic Church's "wealth" is in property (churches, monasteries, schools, hospitals, art, etc.).
Whereas the Mormon Church is run like a for-profit corporation that has close to a quarter TRILLION dollars in mostly fungible assets.
Plus, the Mormon Church is much smaller in reach and population. The Catholic hierarchy isn't particularly concerned about whether people in Sri Lanka get to see Notre Dame win a natty. The Mormon Church is VERY concerned about how Americans view them; they desperately want to be seen as "normal." Throwing $20 million at a national basketball title and all the press coverage that comes with that is seemingly a very worthwhile investment for them.