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Yes - I agree, in the long run, our overhead will definitely be less as compared to fiat (no debit/credit card fees etc). Also the cost to send and receive is very low as compared to fiat.
We definitely don't want to do this: "slapping massive fees to stop bad behavior punishes honest actors". It was an error of judgement to add massive fees.
With that being said, we've set all the fees to 0% at this time until we reach a general consensus with the community. It will give us enough time to think it through.
And thank you for voicing your opinion - we want Predyx's business strategy to be community driven. Without the community, the business has no value especially in the Bitcoin ecosystem.
I also think its a good time to create more visibility on the market dynamics. We'll work on making all the pertinent fees and liquidity related information available on the market details page so that the community can see for itself and make their own judgements. Just like the example below (we'll add more details wrt fees collected)