The London close has been framed as a three-day gathering of rugby supporters, a festival-style cousin of Glastonbury for the oval ball.
Even a fraction of a large festival crowd assembling for such an event would underline the scale of the gamble.
The prices are not being given away. Organisers have set that range for the closing day’s two matches.
One point will be awarded to the winners of each match from sixth versus sixth through to second versus second.
The format means league position on the last day, not an unbeaten run alone, will decide who contests the showpiece.
The wider event has spanned a fortnight. Even so, the ticket figure remains striking.
The so-called Hemisphere Challenge will be settled on a Ryder Cup-style final day.
The coming month is a significant period for international rugby union.
All involved need the rugby itself to seize attention from the outset.
Two points will go to the winners of the grand final.