Few days back someone (dallyshala?) posted stats on how much MAID was bought with MSC.
Considering MSC was junk and MAID wasn't, it didn't require Einstein brains to dump MSC on to MaidSafe in exchange for MAID. So they bought many millions of MAID.
The question is if they were smart to sell on time. Looking at the long term chart, it appears that they still had quite a few on their hand because dumping (as opposed to timely selling) has accelerated recently. Maybe they're trying to move to BTC, maybe they simply realized they'd like to balance their holdings between MAID and BTC. And so since July/Aug they started to divest.
Probably 30-50 BTC a day and lately even more, which means they offloaded about 5,000 BTC worth of MAID, if not more. Considering that more than approximately one half of all IPO MAID were bought by MSC buyers, they quite possibly had over 200,000,000 MAID at the outset and so it's very difficult to even guesstimate what is the situation right now.
This just my speculation and a quick take at what I guess might be the source of MAID of the Dumping Whale(s).
Another interesting thing, I think, is that before we assumed the IPO annoyance was the last unpleasant thing related to MSC, but this - the fact that those guys have economic interest to sell before the BTC buyers - could be Part II.