OK, I'm waiting for 2 withdrawals, hope to get something before year end when my tax bill needs to be paid.
However, leaving that aside, let me tell you of something that happened to me in the early '80's
... at the time I was a hardware engineer at IBM looking after big mainframes. One Friday we got a call to a major UK bank who had lost one side of one of their mainframes - it couldn't be fixed there and then and the part needed wasn't in country. Fastest the part could be obtained, from Montpellier, was sometime late the following day (Saturday).
Before we could go ahead and order, set up support and arrange for an engineer on site, the duty Ops Mgr at the bank had to get approval to write off £9.3 million since the funds residing on this system could not now be assigned to an overnight deposit account - the £9.3M was the interest that would now be lost!!
So, how does this relate to MA? I reckon that real money associated with in-game liabilities has been transferred from the 'dynamic' daily account (let's call it) to their 'static' real-money account where it gets real interest.
There it sits for a month at least, gains interest which feeds back into MA funds - then it gets released to you.
I'm a freelancer in real life and I get paid on a variety of terms, the shortest of which is 30 days after submitting an invoice, which sometimes drifts to 50 or 60 days and i have a big enough buffer not to worry if this happens - it's all part of the (accepted) finance game, make money where you can - simples.
Of course they could do an immediate SWIFT or SEPA transfer, but why do that when they can a month's interest first?