The chinese businessman in the other thread explains it very well. Basically the PBOC is too big to typical involve itself with something as small as bitcoin (which shows how threatened they are by it). For this reason, because the PBOC communicates with only the top level bank officials, the top level bank officials feel its beneath their pay grade to deal with and it gets passed down and eventually lost, because the people authorized with the responsibility don't want to do it - its embarrassing for them. It is in fact the exact opposite of what many bitcoin enthusiasts imagine - bitcoin is actually TOO SMALL for the banks to want to deal with closing all the accounts.
I don't know how much we should trust that Chinese businessman's analyses. (How much would you trust a random American businessman's analysis of the US Government's policy about bitcoin?)
That said, most of it seems to make sense. Huobi's trade volume is sometimes over 100 kBTC/day which means 50 M$/day, but that is only internal accounting and generates zero revenue. They may take 1-2% of cash withdrawals, but even with 1 M$/day of withdrawals that would give 20'000 $/day at most. Is insider trading their real source of revenue? In any case, their revenue is probably less than that of a typical supermarket. Would the US Federal Reserve Bank care about the troubles of five US supermarkets?
However, I would guess that money, rather than embarrassment, was the cause of the delays at the bottom of the command chain. The banks definitely charge a few % for deposits and withdrawals. Several thousand dollars per day may mean nothing for the PBoC, but may quite significant revenue for a single bank branch. The branch managers would want to keep that revenue coming in as much as they can, I would think.
They already said they are moving out soon...
