For todays increase in BTC price "fresh money" was used. BCH is stable around the $1200 mark and a market cap of 20bn $.
Well if BTC price stays too long under 6500$ mining BCH will be much more profitable. Maybe some entities are interested that it stays that way
tldr, at the morning i sold some BCH at 0.186 and bought it back at 0.167...a little fun