I surely don't act out of reward envy, and a lot of people delegating to us or following our trail don't even post, so they don't either.
I'm not as worried about investors as you are. I personally know about >1M STEEM that was bought because of the possibility to counter self voting and its variants, by people who believe in the idea of finding an equilibrium where "good" content gets the most rewards. Those also know that nobody "made" anything before it has been paid out. That is accepted afterwards, nobody tries to take something from others wallets.
Many smaller users see a positive change, so they might become investors themselves in the future.
We'll see.