>>9311149-Barbarians and fantasy were big in the late 70's and early 80's
-D&D hit in that period
-Conan the Barbarian was a big success
-Many rip-offs and cash grabs on Conan at the time, including Beast Master
-The major toylines at that point were Star Wars and G.I. Joe.
-MOTU had defined characters thru mini-comics, commercials, licensed comic books, children's books, and cartoons.
-Large assortment of characters like Star Wars and G.I. Joe.
-Lots of gimmick toys, which was a relatively new thing at the time.
-Kids hadn't had a toy before that was exaggerated and muscular in a way like He-Man with wacky characters like the line had.
-Toys were bright fun colors
-Had a good playset in it's initial release with Castle Grayskull.
Just look at this catalog at what your options were as a kid back then.