I completely understand the Googley argument that you can't provide much customer service if you have millions of users with a tiny average revenue, but what sense is there in treating a €600,000 account so poorly? Surely they must know that they have lost him forever as a customer.
The only logical answer I have as to why PayPal do this to big customers is that they know that as soon as anyone gets big they leave for a cheaper merchant account, so their account freeze is just a way for them to hold on to a customer long enough to make some real money out of them. I can't believe that they would, but I'm struggling to work out why else they would act like this.