Could be the Dev's doing some play testing. Or some lucky friends of theirs.
Or it could just be a case of some guys who've dropped a large bit of cash on the wheel..
But how do you know for certain that their all their towns are maxed at Level 10?
It's also quite possible that they might have capped a few level 10 Barbs, abandoning their own towns as they go.
Suffice to say they won't get banned if they have been spending real money...