Looks like that 4.5 BTC was 100% funneled into a wallet that has had over 19k BTC pass through, and is sitting with 4,200 BTC in it. Odd.
Not odd, the wallet you're referring to is BitPay. Every BitPay account is linked to it.
Well there you go! Thanks

Never meant to imply that anything nefarious was taking place, wizkid is on the up an up. We have lots of hash and we love it, here; bad luck periods notwithstanding.
The 4.5 might have been a portion of donations or whatnot being cashed in for server fees or other AP who do not accept bitcoin, but that's even more speculation.

If everyone in the pool donates what we do (which is unlikely) then 4 coins is ~2 weeks donations, I wager that it's way less than that and that on average the donations aren't a third of what I'm calculating, so that may have been a month or more payment for servers, bandwidth, etc...
Perhaps some anti-terrorism / extortion measures put into place to protect the pool!