For Tony Stark, being poor makes him more of a Peter Parker equivalent. Also, having a suit of high tech armor likely means he’s sourcing his components from some very wealthy companies anyway. I feel like owning the companies feels a lot more moral than stealing from them.

For Bruce Wayne, being poor makes him more equivalent to the Punisher. By himself, Batman has to be at odds in hiding his secret identity and, to some extent, getting lost in his alter ego. In the Justice League, Batman ends up being de facto leader a lot of times because that is because he is funding the organization and his leadership skills in Wayne Enterprises and up matching well for the Justice League.