[bisq-network/bisq] Adopt fee model to de-incentivize offers with huge market price distance (#4630)

[chimp1984]

> The highest that _average_ premiums reach is 7-8%, but most are much lower.

Thanks. Good to know what are our numbers. 

I agree regarding framing. But it is not only costs it is the balance of costs vs. gain for the network.
An offer in a new market might be online for months but provides and important value to bootstrap a new market.
An offer with 50% price tag on an established market does not provide any value as nobody will take it.
Network resource cost are for both the same but benefit for Bisq users is very different.

We need to find a simple indicator to which correlates best with that balance. Otherwise it gets more difficult to implement and more complicate to explain to users.
For me the diff. to market price is the most clearly correlated indicator. Also in a bootstrap market a 50% price tag will not help Bisq, rather the opposite as users get the impression the get ripped off at Bisq if there are only a few offers and those are super expensive. 
And to avoid confusion to normal users we could activate this extra rule only at a certian threshold, so no need to explain it for 99% of users. If 7-8 % is observed premium, then I think any offer > 20% will be basically never taken. So to apply on those makers those rules will not lead to any loss of volume, but to hopefull reduction of pointless offers. 

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