Only a limited amount of tickets went on sale yesterday. No premium seats and no seats in the center blocks on the judges' side.
Some of those judges' side blocks probably never go on sale (VIP), some others will probably be sold as combo packages with hotel etc.
It will be interesting to see when and how many seats on that side, and on the Ice Level, actually go on general sale...
Premium seat available April 22.
http://www.helsinki2017.com/tickets
"To book the Premium seat, please contact the office of the World Figure Skating Championships 2017: [email protected] . The Premium tickets will be available through our ticket agency Lippu.fi on April 22nd."