I second this suggestion (and agree with the hypothesis, although its probably not just a function of raw problem complexity, other variables must come into play)

Hasnt it been done already? Couldnt find anything I would class as 'scientific' with a quick google search. Would be a good thesis for someone.

I have always thought a 3d casino would be a 'winner'.

You could walk around the gaming tables and watch before deciding to take a seat, chat to people, etc, etc.

don't forget the free virtual drinks and suites for high rollers! :) That's a really good idea; thanks for sharing.