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The current memberships are set by the standing costs of the organisation (player salaries, staff etc) + ground rents. There is no reason why the standing costs should change significantly, so the only real change is effectively one and a half ground rents. What they've said to date is that Subi was $1.9M, so over 6.5 games it was effectively $290k/match. They've also said that ME Bank halves that, so call it $150k/match. Spread across a working average crowd of 15,000 (say), that is a tenner a match so there is not really any justification for the memberships to go up by more than ~$20 even assuming no additional revenues from the expansion.