I'm asking because I think it could be a decent investment, but on clarkmoody the volumes aren't very large.

Which could mean that bitcoin is only useful in small volumes, and that larger transactions (i.e. $ 5000 - $ 10000) will have to much of an influence on the price to be considered a wise investment (i.e.: you wouldn't be able to buy/sell everything at once without the price dramatically rising/falling). Any ideas/suggestions from the experts?