Just look at the current season:
New teams Lev Prague and Slovan Bratislava alreay developed a real rivalry with great derbies. The two cities have a long rivalry that goes back to old Czchoslovak times => perfect idea by KHL.
Then off course a lot new fans were found in Czech Republic and Slovakia. The same goes for Ukraine with Donbass Donetsk.
With futher expansion more fans will be won.
New teams Lev Prague and Slovan Bratislava alreay developed a real rivalry with great derbies. The two cities have a long rivalry that goes back to old Czchoslovak times => perfect idea by KHL.
Then off course a lot new fans were found in Czech Republic and Slovakia. The same goes for Ukraine with Donbass Donetsk.
With futher expansion more fans will be won.