Volume Plotted on Y Axis?

I noticed a trader at my firm who plots volume on the Y axis as opposed to the more traditional X axis and was wondering what benefit this provided. I tried to talk to this trader but he had a few positions on so I didn't want to bother him. Thanks for any info.
 
Volume plotted on the Y Axis indicates volume across price as opposed to time, which is how volume is plotted on the X axis.

Some TA packages allow this and I think Stockcharts.com does.
 
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