At this year's Game Developer's Conference, a lot of hay was made over the concept of microtransactions and the free-to-play model. Attendees seemed split right down the middle, some for, some against. It wouldn't be a stretch to characterize the Massively readership as similarly split. But for those of you who love your free-to-play MMOs, is there anything that would get you to pay a monthly fee?
Many titles have the option to both play free and pay a monthly; Dofus, for example, and Second Life too, to polarize the offerings. Are there any such models that have shot themselves in the foot by making the paid content not appealing enough to energize users to pay? If not, what will it take?