Look at it like a political poll, it hits different areas and different segments of the market. ECCIE is just one of those. It would be naive to assume this site is the only source.
548,778 members total for the site. A sample of 50. Is insufficient to be a accurate poll. 5000 is a large sample size for that. So many different sides of the coin there.
We do not know how many of the 500k are in the DFW area or Texas.
You can not assume since they read the post that they had an opinion. They could have looked at it as non pussy related.