The final two rounds of the season will provide one million reasons why suburban grounds remain vital to the future of the NRL.

That's the tidy sum the Cronulla Sharks, Manly Sea Eagles and Wests Tigers will collectively bank when they all hang the 'House Full' sign during the final two rounds of the season.

Surburban legend: The Sharks celebrate victory over the Warriors at Pointsbet Stadium. Credit:NRL Photos

The Sharks sold out four days before Paul Gallen's final game on Shire soil and could have sold nearly double that figure, according to club boss Richard Munro.

"It's a once-in-a-generation moment for us on Sunday,'' Munro told the Herald. "The ticket sales have proved that. We could have sold the ground over again because of the demand. We can't fit anymore into the ground.