The average reward will statistically decrease as validators increase, but it’s mitigated (or even reversed) by two factors:
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More slots for validators to earn (look into releasing fixed validator slots). There are only so many open slots, and that will grow over time. As sharding increases, the number of available slots will increase to over 16,000.
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More transactions to validate. As the Privacy network is used by more and more people, there will be more work for validators to do and therefore more opportunities to earn, as well as more fees paid.
The increase in validators is not meant to increase the demand for PRV and raise the price. That may happen, it may not. The point of increasing the number of validators is for greater security and stability in the network.
As for the decreased ROI due to staking 1750 PRV, that is somewhat of a misunderstanding. That 1750 PRV is always yours, even though it’s locked. If you bought 1750 PRV to stake today at $1.70, and in time PRV becomes $2.50, that’s better for you. Not only does the USD value of your PRV reward as a validator increase, but you can unstake and sell the 1750 PRV for positive (but definitive) ROI. If you don’t sell, your ROI hasn’t decreased because you’ve already staked, you don’t need to buy more at a higher price.
This is one of many reasons it’s better to get in early as a validator, because the cost of the 1750 PRV has consistently gone up over time. That said, this is all speculative, and we can’t predict the price of PRV, nor do we want to. It helps to disassociate the USD value, because that’s not really what Incognito and PRV are about.
The bottom line is, you stake but always retain ownership of 1750 PRV. You earn PRV rewards, the pool of which decreases by 9% each year. As transactions and slots for validators increase, you’ll earn those rewards more frequently, which means that even though the block reward pool shrinks and there’s more competition, you may actually be earning more consistently and more in fees.
Hope that helps!