how can there be nothing to gain?? The experience of participating in such a tournament is invaluable. And if you manage to win against someone or even make it to the second round, that's great.
But if you reason like that, then 90% of OFB participants have nothing to offer, so why bother with it at all? The process of participating in the tournament is interesting in itself.
I believe that the winner of the "Novice" tournament should be given the opportunity to participate in the FB without selection. And whether he takes advantage of it or not is another question.
But in reality, a novice takes a slot from one of the strong players.
It would be logical for a novice from 2019 to participate in the OFB in 2020; then we can talk about a rating threshold, and the novice will have time to prove that he is worthy.