Interesting thoughts all, but I have to say, for us the more we add to the free edition, the fewer sales we get. Open-source projects use a different model where most of the product is free, the titans of the industry like Unreal can rely on revenue from royalties of major commercial titles, and some other tools are backed by billion-dollar corporations who don't necessarily care about running things at a loss. I think we're actually relatively unique in being an independently run, small/medium-scale commercial business with subscriptions, and making a success of it. However we also have to make sure that's sustainable, and in its current form, it is. Unity are losing about a billion dollars a year at the moment so clearly they're thinking "this is unsustainable, we need more revenue fast", and look where that's ended up, and I think that's a good reminder of the importance of having a sustainable business.