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

[chimp1984]

I looked at the current data again. Now we have about 500 offers. In the main markets we have:
26 EUR sell offers with > 20 %, most have tiny trade amounts (tiny trade fee)
9 USD sell offers with > 20%, most are in the 50-100 usd range
XMR seems ok
3 BSQ sell offers with larger % and 11 BSQ buy offers with larger %.

It is about 40-50 offers which is about 10% of total offers. It is not a terrible large amount but 10% of network load generated from offers (which is the main producer of load) is basically wasted resourced.

I also looked at trade statisitcs in the major markets and there are nearly no outliers with huge price difference. I saw 2 and both had very low trade amounts (-> low trade fee) and happened 2 months back. 

I think the easiest solution would be that we reduce the currently 50% max price diff. from market price to 25%. This is still high enough for reasonable offers in niche markets and is not applied to markets where no price feed is available (like BSQ) which is for technical reasons mainly but can serve here as benefit as well as those markets are usually low volume markets which justifies higher spreads. With a bit extra effort it could be applied there as well though...

 




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