Yes, but not rates being charged for using the listed skill. As to the dreaded axis values: I think your chart, in this context, does exaggerate the variation

Yes, but not rates being charged for using the listed skill. As to the dreaded axis values: I think your chart, in this context, does exaggerate the variation in hourly wage by skill. At first glance, almost all your data points are between $25 and $35. Clojure hourly wage is around $31 per hour from the interactive chart. Your lowest hourly wage for a skill, haml, is $25.90. This simply is not much of a difference and your chart should make that clear. I like your article. It is interesting, and I appreciate your efforts to take this data and provide some value out of it to the community. I think we need to be more conservative in drawing any conclusions out of this data though.