I found this article on Gamasutra very interesting. I am a firm believer in using psychology in your game design and even though in the past i have used loss aversion on a small scale, we are now going to experiment with it on a larger scale in our title Junk: Battles. The idea is that we will create a instant "play now" mode that creates a guest account where no progress will be saved after you logout or close the browser. We will remind the player of this "loss" of progression unless they register now. We hope to accomplish an instant playability option with a high retention of registered users, driving our active vs registered numbers up. Ill keep you posted on our results.
I have produced and designed many games on many platforms in many genres. Have participated in the evolution of this industry from 3 guys in a garage to 50+ Million dollar projects. Still we got so far to go and so little time to get it done!
Now looking to participate in the revolution of interactive game development as we shift from a package goods products that "have to have it all" to the exciting concept of free to play, involve your customer, collaborative development.
My Current company Antic Entertainment is a game development company focused on developing free-to-play titles for all platforms!