Pic above is the 1983 Remco Toy Fair Show Room
Despite all the things going for it, Crystar likely failed for two reasons, one EVERYBODY was getting on the sword and sorcery bandwagon at that time but more importantly, the rules changed in the early eighties, in fact the whole toy game did. While Crystar had a great comic book, thanks to Ronald Regan repealing an FCC law, He Man had a cartoon!
Crystar eventually gave up his battle like many others during this time, Marvel would go onto to produce successful comics licensed from toy properties and Remco spent a lot of time producing toys that aped either Masters of the Universe (Mattel sent lawyers) or G.I. Joe.