Set to go live in the spring, nine businesses will be selling feature packs within Minecraft -- such as new storylines, in-game activities or landscapes to explore -- with prices ranging between about $1 and $10 per creation. Other companies can apply to be allowed into the marketplace over subsequent months. Users wishing to purchase content will need to buy a form of new currency -- Minecraft Coins.
Given Minecraft's quirky LEGO-like graphics, it's more directly competitive from a consumer standpoint with Roblox and Linden Lab's Blocksworld, than high realistic virtual worlds like Sansar and High Fidelity, not to mention Second Life. However, from a third party developer perspective, Minecraft has a huge competitive edge above them all: