As already pointed out earlier in this thread, supes most efficient use of his time would be producing cheap energy for the world, but instead he prefers to go around punching petty criminals and smashing Lex's latest innovations.

Even if you claim "But Lex wants to use his super tech to conquer the world!", then would you rather we still be using stone tools and praying for a good weather or die of starvation instead of somebody developing metalworking, even if they intend to use such metal working to try to conquer the world with swords and armor?

The worst offender may be poor Peter Parker. His web shooters are nothing short of revolutionary tech, and he explicitly can mass-produce them out of cheap common materials since he isn't rich like Bruce or Tony. Yet he keeps their tech a close guarded secret. It's not like they're even a super dangerous weapon, but would do miracles for all sort of engineering fields and rescue forces and whatnot.