It’s important to tell that Maidsafecoin could be bought with both Mastercoin and Bitcoin.
Because of how the Mastercoin protocol works, the mastercoin foundation was able to automatically stop the sending of Mastercoins when a certain % was reached. This wasn’t possible with BTC, which lead to receiving an amount of Mastercoin and Bitcoin worth 452 million maidsafecoins instead of exactly 10% (430 million).
A lot of buyers with Bitcoin wouldn’t have received their coins if Maidsafe didn’t loan the 25.000 (not sure of the amount) Mastercoins from the Mastercoin foundation, so Maidsafe could still give the Bitcoin buyers their Maidsafecoins.