Short answer is no, every show does not need to sell out, and just because they dont doesnt mean the demand isnt there, Fyter Fest and Fight For The Fallen are not big/main shows, ofcourse they arent gonna sell out. And even though they didnt and wont, that doesnt take away from the huge demand there was for All Out when tickets went on sale, same with Double or Nothing. There is a undeniable audience for AEW and it shows, they could have sold out a 130.000 stadium for the show (All Out) if they wanted. Though they didnt know that, even so they probably wouldnt go for a stadium like that anytime soon, its smart to lower your expectations.