Greed or maximising income? I would estimate that the London venues at least double the income that the provincial grounds could raise.ECB and already rich county greed.
They'd not have a test at Lords/Oval every summer if it wasn't about that.
I know we talk about tradition but then we didn't have some of the test grounds we do now in the past.
So long as the provincial grounds get regular England T20 or ODIs I think it's fair enough.