Poland - Paying up front?

One of the "April intake" for Dr. Simka's clinic, who had already made travel arrangements (because his appointment was pushed up to March, I believe) received this message from the Euromedic patient coordinator today:

We are very sorry but will you please cancel your hotel reservation?

As of 15th February we are offering only the full package of treatment (which includes all the costs of examinations + logistics package:

accommodation + transport).

The whole cost is 6 900 euros, the cost of accommodation and transport is only 500 euros.

As you can see, the price of accommodation (four star hotel Qubus, 5-nights stay, http://www.qubushotel.com/) is definitely not much.

We kindly ask you to pay the full price of the treatment together with the logistics package (treatment, accommodation and transport - 6.900 euro in

total) via bank transfer at least 21 days before the day of your arrival.

You will be given the account number and all the necessary details in the nearest future.

Yours sincerely,

I've got a feeling that some people have been having the treatment and not paying.  However, you'd still think they wouldn't demand ALL the money up front when it's not even certain that the patient will be getting ALL the treatment.  I suppose they don't want to use credit cards because of the fees.  It looks like some people will be having this out with them before I will.