The joke is that Tony depends on exploiting lower class, working people. Hulk is suggesting investing in society, the poor. The next panel is Hulk launched into space (which happens for a different reason in the movies), because Tony doesn't want Hulk to be listened to, because Tony would lose money.

Uhh, I can't tell if this is a shitpost comment or not, but I'll take the bait.

Ideas like sharing and improving the situation for the poor are perceived as dangerous to rich people because they would need to treat labor they are exploiting as people. It would cut into their profits and therefore the luxuries they enjoy