I will once they unfreeze the coins that have been sold below the rate I entered. Just wondering if anyone else is getting this problem and to warn others to watch out for it.

Settings are simple. Price per 1BTC? I entered 12.5EUR it sells for 9EUR.
They just added a moneybookers and a dwolla service today so I reckon they messed up their code somewhere when adding this.

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Are you sure, you entered your order without typo?

I've got only good experience with Bitmarket so far, selling this weekend last time.

And it happend already twice to me, that my counterpart asked for cancellation because of a typo on his side.

Perhaps you should write an email describing your problem to BitMarket staff.
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Hey,

First I thought it was a typo then I tried again after the counterpart allowed the cancellation and it happened again. I have emailed and Twitted them to let them know. No response yet.

Tell them directly here: http://forum.bitcoin.org/index.php?topic=5441.260
They closely pay attention to the thread mentioned above.

You can read about it in the original thread. Please post feedback there from now on, because we have notifications on this thread and can respond quickly to messages in there.

Why do people use C2C exchanges at all?

You are exposing your personal details to a total stranger with no credibility, esp. if you divulge wire info they can grief you a lot if they're bitter.
(And they're slow)

Sure you can say the same about TH or Gox but they're automated exchanges dealing with huge volumes.

On the other hand there is no single entity to be breached to leak account info of thousands of people.