Do promoters make a big fail?

Generally promoters announce fights stagnated across a period of time. Here’s a thought - which would work for dazn in particular. One huge press conference , a 4 hour show? 3 months of upcoming matches. Announcements throughout of various shows, golden boy, matchroom and Bellator if they like. Joshua vs XXX Canelo vs XXX GGG vs XXX Wouldn’t that be a better marketing strategy to drive subscriptions? I’m surprised they have never tried doing it that way? They could even do smaller fights in build up with clips of main fighters throughout ready for the big unveil! Some people may already know, some people might not. Put the disappointing fights early so they are hidden amongst the gems!