It is like questioning the purpose of shovels, because surely if shovels generate so much wealth for the miners, wouldn‘t shovel companies ask for a percentage of the gold (say 30%) instead of selling shovels at a unit price?
But saying just because openai didn't adopt a particular business model therefore tokens must be worthless seems like a stretch. Maybe it was regulatory. Maybe they just don't want to be a conglomerate of that sort. Could be any number of reasons.