I think teams with decent sized grounds and good member stats should get more than 55k a week, though as Aussie points out, it should be more like 110k every second week. It's not necessarily going to work out like RL cricket, because as we have seen BT20 doesn't generate huge crowds or cash pools.
I'd give a rough estimate that on the first day you'd expect two thirds of a one-day crowd, then on the second, one third, then on the third, one quarter, leaving you with 1.25 times your one-day takings.
I expect a lot of noobs are going to be burning from their financial decisions. It will now be imperative to minimise training staff and put off ground expansions for as long as possible.