Metro has always commissioned posters for merch and giveaways to fans as well as for promo, for sellout shows as well others.
Since Steve works at Metro I'd suppose these posters were made at Metro's behest, which is their prerogative.
Metro also consistently PAYS ARTISTS which is more than can be said for most venues.
I'm sure if some gper gazed at their navel long enough they could come up with some ethical objection to Metro paying to make a poster for their own sold-out show. But that's more navel-gazing than I've got time for.