The finals like they are now are pretty pathetic. In many leagues you will see the away team tank game 1 and two, just to decide the series in game 3. In such a case I really understand the "logic" behind a lower game three attendance. I realize a game "7" in the real world will be sold out no matter what, but at the same time no real franchise would intentionally lose a game (by an absurd margin) just to get an additional game.
Simplest solution would be to shorten the series to a one game final, played at a neutral arena. Or play home and away and let point differential decide.
Größter Knecht aller Zeiten aka His Excellency aka President for Life aka Field Marshal Al Hadji aka Lord of All the Beasts of the Earth and Fishes of the Seas aka aka Conqueror of the Buzzerbeater Empire in Europe in General and Austria in Particular