Normally these holiday tournaments are 1) at small gyms (high school, D2, hotel ballroom, etc.) 2) hosted by a local school participating.
PK are in massive 20k NBA gyms whose local teams (Portland, Portland St.) have no fans, and unfortunately Oregon is bad and not a basketball school anyways. Whereas Maui takes place before the holiday, the PK literally played on Thanksgiving. Who is going to plan to go to this event when you either miss a game or go on literal Thanksgiving.
Especially when all the schools with big fan bases are either in East Coast or midwest outside of Gonzaga (who did actually have fans there).
And it's not like Portland is Maui or Atlantis, a good excuse for the non-basketball fans.