>At some point (perhaps V4) when your price nears the $500 mark, then it won't be such an easy decision for many people anymore. MoI then becomes a "main" package for many people instead of a "support" package.

I think Jonah has a valuable point here, MoI as it stands now or even at V2 completion is and will be very very good Pipeline Tool but it can not stand alone. To put into perspective:
Rhino $788
SpaceClaim LTX $825
Shark LT $475

Now let focus on the lowest price: Shark LT $475
__________________________________________1:Based on Dassault’s ACIS™ modeling kernel.
__________________________________________2:2D, 3D, surface, and solid modeling tools.
__________________________________________3:SAT, IGES, STEP, STL, OBJ, VRML, and DXF/DWG.
__________________________________________4:Windows and Mac OS X platform.

Conclusion: As Jonas said at $500 mark MoI becomes a "main" package, and to be honest that's I want MoI to be, But it needs to compete with others in features, compatibility etc.Then we have a winner.

ps.Sorry I write in bullet point I have to take my daughter to a pantomime.