Day of the Week Sharkscope Graph

I just checked my sharkscope graph to see which days I was most profitable on and I was a little suprised to not see any losing days, which I had a couple of last I checked a year ago, but also that apparantly on Thursdays I have 90% ROI for just under 1k games. I should really be playing poker right now, but getting high and watching the Three Amigos and eating take out sushi with the girlfriend seemed more appealing. Go figure.

Still, I'm not sure these graphs mean anything. Does anyone?