Well, I think actually that most of MMO (especially those are following F2P model) works like old "Shareware". You can get "full" game at your fingertips for free - but if you want to progress further, you must to pay.
Also, I think, Telltale and Grimm games was following the same SW model: first episode for free, but everything else is for money. Not now - I checked, and everything is paid now. :/ I dunno why - maybe Steam boosted popularity of the model and companies itself, so they don't need such sort of promotion anymore. Or maybe it was designed as time-limited offers right from the start.