[throwaway894345]

> Can you as a human sell things to another human for more than you paid for them in a situation where you are both happy with the price?

I would be really interested to understand how someone can exchange a good for someone else's labor (which is what you're describing above) but they can't invest--which is merely paying someone's wage in exchange for a share of the profits. In both cases the participants in the exchange find the agreement to be mutually enriching, so it's not like either is particularly inherently exploitative.