Seasons 5 & 6 dvd

Why would Shout Factory stop after season 4, just because the last two seasons are syndicated? At least I assume this is the reason. The last two seasons of Punky Brewster. also from Shout Factory were syndicated. But they were able to release those. What makes Webster any different? The season 5 & 6 episodes of Webster are available on 123movies websites. Unfortunately, they can't be played.