"A compiler is a special program that processes statements written in a particular programming language and turns them into machine language or "code" that a computer's processor uses."
xanxion, asking for more stable exports from Scirra's small team is a waste of time. They need more money and workers before they'll be capable of performing such a large task effectively. Although I do agree that the subscription based model is not good when combined with an engine many of us have already bought, I'm hoping that the money they're capable of making with this update will allow them to do just this, and meet the demands of the users.
It's probably best to assume that this high price is being asked because Scirra wants to be able to include the features their users are asking for, which means they will have to grow more first.