I call bullshit to the idea that there's only this much audios over two decades of VA labor. I'm absolutely sure they made more. The question of 'why are we only seeing this much' has several possible explanations, though.
One is that the leaker/Nick is keeping the rest out with the intention to drop more once there's attention of Toei/bigger controversy than it was when he just let a stream of people listen to Piccolo rape Yamcha.
Two is those were the spiciest bits and most others are as filled with entertainment as the one where Monica and some other twat just giggle and say penus a lot. At this point, fifty gorillion more audios of ear-shattering HIHIHIHIHI PENUS WENUS doesn't make a difference.
Three is this is all that's saved on the current Funi servers and thus all the leaker could get.
I hope it's the former, as my dream is hearing Freeza scream about Saiyaniggers.