I think it might be worthwhile to consider that their not trying to sell out a Wembley sized stadium - Windsor Park only holds about 18k.. Frampton already sells out the arena which is about 9k so if they throw on Fury, Paddy Barnes jn a world title fight as well as other local fighters this won’t be an issue at the box office IMO.
I wouldn't say it's a guaranteed success. Warrens promotions tend to be poor. Bixing people already know this. At some point the general public and casual fans will wise up. This might be that point.
Was the promotion poor for Framptons last 2 fights? People might have issues with Warren promotions for different reasons (I do too) but his last 2 events have been a major success at the box office.