Errrm Nick Breckon forgot to mention that ALL of the money that those mods make is ENTIRELY GIVEN TO THE CREATOR OF THE MAP, blizzard doesn't get a penny out of that.
And the MAP CREATORS are who mark their map as Regular or Premium.
They are just giving the map creators a chance to make a mini market out of their custom maps.
And i don't see this a crazy idea, seeing that they even showed a video from a plane game using protoss flying units lol (you know, those where you control a plane, move it in 2D, and other planes come from the sides, from the top, all shooting, and you have to evade the shots and kill the planes, with bosses, pickups and these things), they showed a 3Âº person shooter too, in wich you control a ghost, or they showed too a turret... SHOOTING UNITS to enemies (not just an added skin to the shot, they were actual units that can be targeted, and fired, even in mid air, in this case those were banelings, that were killed in mid air by an "ubralisk" a custom ultralisk that they modified in the editor that had spine crawler turrets on his back, and well this thing could deform the terrain too with 1 custom skill they added) so, we will probably see games inside the game, like in warcraft 3 but some maps could make that difference extreme, even considering the diversity of maps that war 3 had, and how different they were from the original game.
As long as the map creators doesn't start beeing too greedy, in wich case their map will just not be downloaded and he/she will have to put it for free anyway, it will be all ok.
Dont over react without knowing the full story :), that i do because i saw the direct tv stream ;).