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I think it's a game of fees. I hear OTC fees can be insane, tens and tens of percents. But by blocktrading on an exchange, you might even get a reduction of fees. Don't 100% quote me, but i'm fairly sure thats the case.

I know a few guys that do OTC trading and there is some fees but it will not be that bad or they would not do it...
I will ask, we have our meetup tonight anyway

Please do let me know :)