... I don't see any reason for this week $3000+ pump

My money's on the Yuan devaluation.
Well, not my money. My money does not react to transient circumstances. But I think there is a good chance that the Yuan devaluation has something to do with the price bump.
Something something Chinese punters' savings worth less something something Chinese punters getting scared about loss of savings something something Chinese punters look for stronger asset to hold value something something Chinese punters buy Bitcoin.