Well that's a question of how you apply these things. The example you are giving is obviously one of the less good ones.
Drinking tea is considered healthy, but I can still drown in it. You get the idea, everything that may be good in theory can be taken too far into the wrong direction.
I wasn't trying to just give a bad example, but a weighted vote goes against 'one person, one vote' which is considered a pillar of Democracy. A weighted vote would certainly mean the marriage between Capitalism and Democracy had been consummated.
Well, you must look at this topic from another point of view. We think that democracy is the best system to have. It is not, it has plenty problems on it's own, as we can see right now after having lived with it for quite a while.