It's not that difficult to come up with that on your own.
You need to realize that what TradeHill did was for your benefit, not theirs.
Let us say I am a bank. I have thousands of customers who use online banking for a variety of reasons. One day, as the CEO and decision maker for the company...I decide that to protect my users I must disable online banking as it is too easy for people to be keylogged and have their accounts hacked into.
So guess what, I am going to just pull the plug.
Oops. I just lost a large amount of business because my customers relied on online banking, and had no notice to prepare for the change. I know if I was a customer and that happened to me, I would be extremely angry at the bank and close my account the next day. Personally.