re: Why doesn’t LSU use the baseball logo for more apparel ?

LSU is very particular as to how the letters LSU are presented. Effectively, "LSU" is the school's trademark, and most recognizable logo. Therefore, LSU in Geaux font is to be used as much as possible.

Back in the early 2000's, pretty much every department on campus had a different logo or way of presenting the letters "LSU". Because of this, LSU's marketing department has been working hard to eliminate variance.

The baseball team's LSU logo is an exception, since it, too, has a signature "brand" all its own. Outside of baseball, though, the logo is downplayed.