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BCH has much less Hashrate and Difficulty has only started to adapt to that, so BCH has only had 26 blocks since the Hard fork while BTC has had >200 blocks (which means very little transactions for BCH have been processed)... I'd give it a week or two before we see if something actually happens : difficulty will adapt to the lowers hashrate, blocks will be coming faster people wanting to buy will be able to buy/sell will be able to do so unrestricted