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Because of this, yes, more furries, the website users, and martha steward living subscribers are probably located in areas of high population density. 

This is not about control variables at all, but rather, poking fun of the trend where reviewers/customers want you to GIS map where the users/consumers/respondents who do X are located.  A fair number of times you may find that more <> are located in heavily populated areas. 

As a result, the point is, when GIS mapping, be aware of what you are doing.

With statistics, though, I would suspect that the questions are either utterly trivial (“how do I test non-parametrically for equality of the distributions?”) or so central to the project (“how should I design my clinical trial?”) that the statistician’s name should really be on the paper anyway.  Ultimately, I think the attitude that statistics is something you can deal with as an afterthought, or even contract out, is a very bad sign.  

In the natural sciences some scientists may be statistically naive, but they’re at least a little sheepish about that fact.  I’ve never encountered anyone who, like, actively denies the very concept of statistical inference until I started reading the comments on this site.

I didn’t say they should do it for free.