I'm afraid I don't follow your logic. We welcome any team who wishes to register for our invitational. We often waive fees, and offer guidance/assistance, to new teams who wish to attend our invitational. But invitational tournament directors don't sign up to help every team in the country simply by hosting a tournament - they agree to host the teams who register and provide a fair, fun tournament to those teams. I firmly believe we have done so for the past 25 years of hosting a tournament.And also to any potential team that could theoretically go as well.
Yes, small/new teams need access to test sets. Invitationals are the best way in my opinion, but admittedly have barriers to entry. However, there are numerous opportunities here on Scioly and elsewhere to acquire test sets. As an alumnus, I'm happy to advise new teams on how to successfully find them. If I write a test for an alumni-run tournament, my preference is that it is released publicly. I didn't supervise at MIT to benefit MIT - I did it to benefit Science Olympiad.
But I do coach Solon HS to benefit Solon HS, and I direct our invitational to benefit our team and the other participating teams. Releasing our invitational tests publicly doesn't serve those goals.