I don’t know if it has already been discussed : couldn’t we make the commission fee depend on current voting power (percentage of delegated atoms) ? For example minimum commission fee could be set to current voting power * 3,33 :
- new validators with 0 delegated atoms could then propose 0% commission fee, so they can attract delegators
- with 2% voting power : 6.66% commission fee (or more)
- with 5% voting power : 16.65% commission fee (or more)
- with 10% voting power : 33.3% commission fee (or more)
- with 20% voting power : 66,6% commission fee (or more)
- with 30% voting power : 99.9% commission fee, so people are strongly discouraged to delegate to a validator that may then get more than 1/3rd of voting power.
This rule also has some other advantages in my opinion :
- it is very simple to understand
- it gives the opportunity for newcomers to become validators, and at the same time it guarantees sustainable commission fee for validators that have been able get at least a few percents of voting power
- it should incite people to redelegate to smaller validators
At the end with such a rule voting power should be equally shared between validators, if delegators follow economic incentives (i.e. if there is 100 validators, roughly everyone should have 1% of voting power with commission fee around 3.33%, if economics are the only incentive)