I mean the only reason Tony Stark is able to be so rich is the fact that he has inherited wealth. His dad Howard made the family fortune and then Tony spent the greater part of his adult life (remember per comic time, it's not been long since Tony became Iron Man) as an amoral weapons manufacturer dedicated to the bottom line. The fortune that Tony has didn't come from his ethical turn or change of heart. To quote 44, "he didn't build that", the he being box-of-scraps-in-a-cave Tony.
Tony STARTED with a fortune, but he's lost everything more than once and had to build a new company from scratch on multiple occasions.