I might not be a good lefty for saying it, but I've never been against capitalism at like a base level. I imagine it'd be perfectly fine in a species evolution didn't utterly fail, but example says we humans cannot have it and remain functional.

I believe that it's much less about profits and much more about power. Being unbeliveably wealthy in a world where everyone have their every need satisfied is less favourable for a megalomaniac than being believeably wealthy in a world where everyone is desperate. People rarely desire expensive jewelery or other (relative) luxuries for their own satisfaction, usually it's used to signify wealth and show power. What use would those extremely rich psychopaths have for their money if there was no human black market to buy a child sex slave from? Where would they get their dose of praise and submission if no one desperately wished to change their dire living conditions and was willing to licktheir boots for that chance? I think capitalism was designed specifically for this purpose, and with class divide growing ever wider, it fulfills it excellently.