Why obsess about the Chaotix being the only ones needing money! It's just a joke! They're detectives, they want money.
It's pointless compared to the 2-world/classic-modern/super emerald debate.
To have more miniseries they can either:
-Do miniseries for the game characters like the Chaotix (that would be great, and the restrictions should not be a problem for the Chaotix unlike Shadow)
-Or create new characters to do miniseries about them.