Because nobody besides Gonzaga and SMC have ever one the WCC Tournament in the modern era. And I don’t think the WCC has ever had 4 bids.
BUT, every year there are 4-8 teams or so who are absolutely devastated because they didn’t get in. And there is a prominent theory that the committee favors power conferences.
https://www.newsobserver.com/sports/college/acc/article139198713.html