SD in $/hand?

[JTG51]

Using data gathered from my online play using Poker Tracker I decided to calculate my SD terms of dollars per hand. I used the formula Mason provides in his essay here, substituting the number of hands played in each session for the number of hours. My result for 2/4 games (after close to 10K hands) is a little more than $6/hand. This seems very low to me since pots are routinely 10 times that much.

Am I misunderstanding something and that is in fact a reasonable number, or are my calculations wrong?

Thanks.