I got the same problem. People who say this is OK are delusional and have no experience with large bank transfers. I totally agree with ab8989. When I receive large deposits in my bank account my bank usually asks me to fill a form to explain the source of the money. But that is the ONLY question they ask. I can fill in anything and they don't ask for any receipts or documents. If the bank suspects something they inform the proper authorities and then it is the authorities' job to investigate and ask questions. That is the normal practice all over the world. Bitstamp already has my ID card, an utility bill and all my banking information. It is enough even to steal my identity. There is no need for them to ask such idiotic questions. Now their support cannot handle all these tickets which were created by them. This is pathetic.
At my previous company, I sometimes would be required to send multiple wires in a day, often totaling $100,000-$200,000, to many different individuals and businesses. When we first started doing this, I was required to fill out lots of paperwork, and even after that, I would randomly be asked to provide more information. This was banking at one of the largest banks in the US.
What Bitstamp is doing may be a bit more than what an established bank would do, but they are trying to err on the side of caution. Quit complaining. Would you prefer they have their funds frozen and stolen, like Mt. Gox?
I don't know what are the practices in USA I live in the EU and I have received deposits of 10k+. As I said my bank has never asked me to answer idiotic questions like "Where did you hear about the USD" or "What are your future plans and activities planned on our Bank". They only asked me to fill in paperwork about the origin of the funds. Furthermore the amount I am withdrawing right now is $6000. I don't think it is so large amount.
On a side note I managed to withdraw all bitcoins I had in there, so bitcoin withdrawals are still working. I think to ask them to cancel the sepa withdrawal and give me the bitcoins. Now I use a local exchange. The only drawback with them is that they buy at 3% lower price than bitstamp. Anyway this is a price I am willing to pay to get my money on time.
I am curious why some people are acting like bitstamp advocates. I remember months ago people were protecting mtgox like they were holy and see where they are now. The fact with these exchanges is that once problems start to appear you must get away from them as fast as possible. It is a matter of time before all withdrawals stop.