ArcheAge's business model? You're not alone, particularly given that the game is going free-to-play in its native Korea next month. Developer XLGAMES and publisher Trion have not revealed any pricing information for the western market, but there is a bit of info available on the Korean F2P model thanks to users on the ArcheAge Source forums.
Korean F2P customers may advance to level 50, but may not own homes or regenerate labor points (labor points are a pool much like traditional health and mana pools, but set aside for the game's numerous non-combat activities). There are other restrictions too, most of them contingent upon whether or not Korean users are playing from home or from their local PC Bang internet cafes.