you should Keep in mind that PoS was designed to secure the blockchain and confirm Transaction
as some Kind of energy efficience method ... compared to Mining via PoW.
and not for generating coins or giving x% interest per year as Marketing idea.
You are right and this is a big problem with PoS-coins:
- If the interest rate is too low, people will go to some other coin, where it is higher.
- If it's too high, the coin will die at some point.
Finding the sweet spot seems like an almost impossible task. Here's a crazy idea: what would happen, if users could vote on interest rate regularly, let's say, quarterly? You take all numbers proposed and find the median. Some will state crazy high rates, others zero, hopefully, a lot of people would be sensible enough to realize that choosing the right amount secures the future of their coin, so maybe, it would be a way to apply "collective wisdom" (I'm not necessarily a big fan of that concept in general) to this problem.
I think users are too stupid to make good decision. Having votes is ok but people are very bad at making decisions that serve their long term interest (look at election!)
There are studies implying, that the more proficient someone views themselves and less proficient they see others in a given technique, the less proficient they usually are. I'm not quite sure whether this is necessarily applicable to intelligence as well. Let's see if we can find out
Seriously, though, the concept of collective intelligence is, that a single person may be wrong, but a group usually isn't, especially in a field, that doesn't really have to do with knowledge, but for example with finding a given number. I've read somewhere about an example being the "how many beads in a jar" question, where participants are supposed to guess how many beads a glass jar contains. Interestingly enough, if you take as many guesses as possible, the individuals are mostly wrong, but the median is extremely close to the real number.
I think we have a similar case here for a few reasons. One of them is, that there is no "optimal" number, because every number falls victim to a conflict of interests. Plus, while you can exclude really high interest rates, optimal inflation is not a physical constant. The system itself can adapt to it.
The question whether or not you want few experts to decide on a number or the collective is almost a philosophical question, until you apply it: once you create a coin, that has votable interest rates, users will vote on whether they like this idea or not by adapting the coin or not. This in itself is pretty much an application of collective intelligence
Coincidentally, this is actually happening all the time.
