This is true, but while the film did great, the toys didn't start selling well until about 81. So if you are 40yrs old now, your earliest memorys might be the plethora of Star Wars 1 and 2 toys, so you could want them as much as any other adult toy.
P.S. Sorry, nobody really used the exact numerals or subtitles back then, they were referred to as "the first one" and "the second one". Then came the 3rd one... "the one with Ewoks".