I’m betting that the difference for Transformers and Joe is that, as a property, Transformers is more widely liked than GI Joe.
Numbers alone, Transformers has had multiple billion dollar films and it’s rare that a Transformers show isn’t running on some network.
Joe on the other hand has had two commercial failures and, I believe, one modest success that led nowhere. There hasn’t been a GI Joe cartoon since somewhere around 2011 it seems (and even then that looks like was a miniseries.)
People who give a fuck about GI Joe *REALLY* give a fuck about GI Joe. But it’s more of a pure nostalgia property than a living ongoing brand. Maybe that’ll change with the next one, but that’s going to be a Transformers crossover. So Joe just can’t seem to stand on his own.
The minimates kick fucking ass though. I don’t give much of a fuck about GI Joe (despite liking Retaliation a lot) but even I think I’m gonna crack and buy the damn minimates soon.