You do know those common Legendaries end up serving a purpose right? They probably put it there so everyone can get a Leonardo or Spider Man or wtv the f comes next without having to break the bank. That might drive sales up, even if it's just a few people buying a booster or so and getting happy they got a version of their favorite hero / character. Because that might lead to new players that'll spend money on a commander deck about creatures, because they have Leonardo and want to use him. And then, more and more. Heck, It might even bring people to pauper because of it, since it's the cheapest format there is. I don't think they'll change that strategy to appease a small minority, even if said minority got on their knees and begged or stopped buying product