Dr. Evilstein doesn't want to market his technology himself because most businesses fail within their first year of operation, and doesn't want to have to answer to employers or investors he considers to be Pointy Haired Bosses.
Dr. Evilstien knows that his invention is too evil and he couldn't sell it legitimately.
if everyone and their brother had access to Dr Evilstein's tech, he wouldn't have the edge.
Dr. Evilstein is really just the Disc One Final Boss, and someone else more powerful is controlling/blackmailing him into using his inventions for villainy.
He can make more money by being a legitimate businessman and a criminal mastermind.
Parodied: Dr. Evilstein creates new construction materials, advanced medical technologies, a Weather Control Machine - and still finds a way to use them in bank robberies.
Deconstructed:
Dr. Evilstein got his start in criminality because he got screwed over by a Corrupt Corporate Executive who stole the intellectual property rights to his inventions. The bank robberies are in fact an elaborate plot to screw this very executive right back.
Dr. Evilstein is an Corrupt Corporate Executive who design his inventions so they would be as expensive as usefull, so only weathiest can afford them and he can ear insane amounts of money.
Dr. Evilstein tried to market his inventions legally, but his business failed. Now he tries to earn money from his inventions the only way he can think of.
Dr. Evilstein tries to move into legitimate territory, but his villainous impulses keep getting the better of him and jeapordising that goal.
Reconstructed: Dr. Evilstein gets the rights back, but continues to rob banks because he's grown to like it, and is wanted by the law.
Zig Zagged: Dr Evilstein starts out selling his stuff to other supervillains, then goes into supervillainy himself, then goes straight for a while but it's really just a cover...
Averted: Dr. Evilstein uses his abilities legitimately to make himself rich.
Enforced: "We can't let our villain just stop his conquest and become a lawful civilian, now can we?"
Lampshaded: "Do you know how much people would like to buy all this stuff? Think about it!"
Discussed: "Couldn't this guy just make more money than banks ever have by going legit?" "Completely correct, but this isDoctor Evilstein we're talking about."
Conversed: "Have you seen the technologies those villains have? Why won't anyone cut Lex Luthor a check?" "Well, if all villains suddenly went legit there wouldn't be much of a story, right?"
