Yes, Bitcoins are expensive, however, I believe that what is important (in terms of trading and speculating) is their long term potential and % change in value over time, I believe that people are put-off by the idea of not being able to own a whole bitcoin, I would propose denominations on the Satoshi Scale as follows:

10 = 1 Gigoshi
1 = 1 Bitcoin
0.01 = 1 Megoshi
0.00001 = 1 Kiloshi
0.000001 = 1 Hectoshi
0.0000001 = 1 Decoshi
0.00000001= 1 Satoshi