Unfortunately very predictable I should have warned people before. Greek promotors notoriously dodgy ( primarily because they can get away with it)There were a lot of people who paid - some up to 50 Euro - for tickets and didn't get in.
The venue know how many tickets they sold. They were letting people pay on the door and therefore should have counted the entrants, leaving space for the ticket holders.
They took the piss, simple as that.
It's a real shame as it looks like it was a cracker.