Your number one mistake is that you read the Greek sports press and actually use what they write to form an opinion.
From the shareholders reports it can be determined that he put around 160 mil Euro in the years that he is in charge of PAOK. As Bananas points out, we should be grateful that we have Savvidis in charge, because without him we would be in very bad shape. Probably gone through couple relegations to 3rd division.
Let's face it the team belongs to Savvidis and he can do whatever he wants with it. Seeing the relentless attacks on him by outside (and inside) forces leads me to believe that he is doing something right.