Well, also because the first season (the show ended up running for a total of four) was pretty weak.
That first season starred John Haymes-Newton as the college student of steel, Clark Kent, attending Shuster University in Florida (where the show was shot as one of the first series filmed at the Orlando Disney/MGM Studios). Newton looked good in the classic red & blue union suit, but was, frankly, a wooden performer. It didn't help either that the scripts for that first season were generally pretty pedestrian and the shoestring budget was extremely obvious. Pretty Stacy Haiduk (later of Seaquest DSV) was a sexy and likable Lana Lang, though. I also liked the casting of Stuart Whitman as Pa Kent.
Somehow the show garnered good enough ratings (it aired on weekend afternoons in most markets) to get a second season, and things improved considerably. The writing - by a number of actual DC Comics veterans like Andy Helfer, Cary Bates, Denny O’Neil and Mike Carlin - got a lot better and more imaginative, and Newton was replaced by the more charismatic Gerard Christopher.
There were some cool guest stars in that second season, too, including George Lazenby (On Her Majesty’s Secret Service) and Britt Ekland (The Man With the Golden Gun) as Clark's Kryptonian parents Jor-El and Lara; Philip Michael Thomas (Miami Vice) as Brimstone; Michael J. Pollard as Mr. Mxyzptik; as well as Keye Luke, Richard Kiel (The Spy Who Loved Me), and even Gilbert Gottfried.
The budget was still low, but the producers were a lot more creative with their money, and the show looked much better in the second season, too. The special effects were about what you'd expect in 1989-90; you may not have believed a boy could fly... but it could have been a lot worse.
I guess in anticipation of the new Man Of Steel movie due next Summer, Warners' manufacture-on-demand label, Warner Archive, will be releasing the second season of Superboy on DVD next Tuesday. Those multi-disc MOD sets can be pricey, but I'm hoping to pick it up soon. I really enjoyed the show back in the day, and would very much like to add it to my vast DVD library.
I mean, what the Hell - I bought the first season.....