Think there may be a strategy here of NOT keeping too much cash on hand.
Seems like they may move money around as quick as they can by (for example):
Paying REI twice a month; paying master grower bonuses for each harvest; buying equipment and supplies as soon as needed; paying off operating expenses like lease payments, electricity, water, etc. as soon as practicable; paying out dividends when they reach some critical mass of cash on hand, etc.
Without any banks accepting MJ business accounts, this seems like a practical alternative to me anyway.