I always prefer seeing them in Alt mode, with the pic of the actual robot form done as a photo or artist's impression. An exeption would probably be for the Leaders and Supreme Devastator.

Legends would look too similar to matchbox cars if in Alt mode, so maybe that's a reason?

Maybe FABs/Gravity Bots aren't selling as well possibly also due to the price?

Parents probably want to pay for something a bit more worth their $$ and can recognize as an actual vehicle that turns into a robot, rather than the other away around as they tend to be easier to store away in alt mode.

I also agree that most kids want something a bit more complex.

I agree that most places Iv been to lately have a small selection of standard deluxes.