Proof of profits based bandwidth allocation , very intresting

===Intro
I was studying the hashgraph protocol (https://hashgraph.com/) and was wondering how to prevent spam as they use "fame" to arrive at the final truth. This would create an incentive to talk as much as possible spamming the network.

So I had the idea of using proof of profits as the objective standard of value to the network. And rate limiting the amount of transactions a person can send based on the profits they make.

This is just preliminary thoughts and needs much more work. Just wanted to get the idea out there.

--------------Proof of profits (PoP)
PoP is the amount of tokens received by a persons account minus the tokens sent in some time period.

------------PoP based bandwidth allocation
An account is rate limited proportionally to his relative size in the earnings highscore list over x amount of rounds.

---------Example
Bob has made 100 tokens over last 1000 rounds. Total earnings is 1000. So Bob gets 10% of the bandwidth for his personal transactions in the next round.

                ---------------PoP is superior to PoS---------------------------

-------------------Earnings is what we want so let's rewards that with bandwidth
One reason to choose PoP over PoS is that the active user who is earning stake is actively removing supply and therefore increasing the value of the token

-------------Attacks
There might be attacks like moving money between accounts to fake profit making that needs to be solved before this is a viable system. I have not yet taken the time to address this attack.