Thanks Graviman. But this is what I don't understand: Lift is a product of disc loading. Surely a wider blade (or one with more angle of attack) would create more downwash = lift. Hence, more blades, and the bigger they are, the more lift, no? Obviously, drag would also increase, but let's ignore that for now.
Also, more blades on a rotor system must mean that they can "slipstream" behind the other blade to some degree, and therefore have less air resistance per blade as compared to a rotor design where the blades can't "hide in the wake of the blade ahead of it", as in a 2, 3, 4, maybe even 5-blade system?
Basically, what I'm getting at - when you look at fanjet engine on an airliner, they have tremendous amounts of blades. There must be a reason for that - why don't they have just 2 fan blades if that's just as good?