Three seperate environments are similar to the DLC idea, although they are not exactly the same, as each is independently playable.
But by buying an extra envi it feels like as if you got additional content for a game you already own. I know those envis are independent, but who thinks of those 3 envis as separate games? Everyone wants one game with everything in it. Thus the concept of buying the next envis separately feels like buying DLC.
And now it becomes even more weird because the second envi you buy costs as much as the original game you already own. Who would want to buy a DLC that costs as much as the original game?

In United it was easy. You payed once and had UNLIMITED fun. In Maniaplanet everything is a bit more complicated and thus less attractive
