Without knowing where the users are based, this data alone is pretty meaningless. Where I'm from in South West England pretty much all the programming jobs are Java (hence why I left), and you are lucky to get £40k. Spain and Portugal have even lower salaries. I'm guessing this is US based, but even then, I'm sure there is a lot of variation. Working in London as a Java developer in finance you could easily get over £100k.
The only downside is that the prices of imported goods (most notably electronics) and software are usually higher than in the US for example. Services are much cheaper of course.
I'll second this. I've yet to ever see any PHP job short of architect paying that amount here (most are 70k or less), same with Java and Perl. I'd like to know where this was collected from....I need to move there.
I feel the opposite. I can't get anyone that knows puppet for under $110k in the Boston area. All these salaries seem low for Boston, and probably the bay area as well.