Exactly... i imagine this happens in all order book 'markets', in order to 'control' price. Therefor exchange prices are not a true 'free market' valuation would you agree?
also the AML/KYC regs are killing off large spenders from depositing/withdrawing large fiat amounts. yea theres an occassional whale that day trades bitcoins and then withdraws bitcoins on exchanges, but the bank account movements are small. and thus another reason i do not trust exchanges as being a viable valuation for 13.3million coins.. when infact its mainly dust amounts being stirred around the pot multiple times.
i cant wait for the winklevoss ETF and proper ETF exchanges to open where their bank balances and bitcoin holdings need to show transparency and have the ability of moving 10,000 coins+ (millions in fiat) as then we will have a better indicator.
so far these sql database exchanges are truly undervaluing bitcoin. in china their minimum wage is 16 yuan which is over 150 hours of labour per bitcoin. yet the western world exchanges based in dollars have 1bitcoin at only 50 hours labour max..