After Elon steals back all the words that X intends to use internally, I think he's going to start "renting" out premium @words - and if you don't want to play that game, he'll just steal it and rent it to someone else.
Elon is trying to raise money any way possible, but his stated goal of "selling" X @handles is not possible now that he's proven untrustworthy and has been making headlines due to blatant handle theft. Yeah, sure... buy something from a noted thief - that's bound to work out well.
So I'm assuming it'll be an annual rental plan. No one with a brain would trust ever him again with any $$$ "handle sale".