Corruption will ALWAYS rise to the top.
Even if you are EXTREMELY lucky, and you get a super awesome, non corrupt dictator who wants the best for everybody and is smart enough to act on it....
the next guy is going to be complete shit and ruin everything.
This has been proven to be no different in a Technocracy. A Large problem is that smart people aren't actually as smart as you'd think they are... and often have huge weaknesses due to their own arrogance and presumption.
The best example of this is actually probably an episode of the Simpsons funny enough. http://en.wikipedia.org/wiki/They_Saved_Lisa%27s_Brain
The truth is... the dumb need representation as much as everybody else for their preferences. Hell more so, because the dumb are... dumb and therefore have less ability to get what they want individually. Sure the smart may want to provide for the poor, but in general, the smarter you are, the harder it is to end up not being a hugely patronising douche who doesn't listen to the poor. (Not that all poor people are stupid, but you get the point.)
