The rental data was likely from a few months back, but it was just announced that Denver is #1 per capita in the country.

Property managers don't provide significant value-add back to owners, such as data and statistical analyses on how to increase the profitability of properties.  

St Louis County and other areas surrounding the city are also very different markets, so I'd be curious to see the parameters for their data and if St Louis stands out as a bit of an anomaly in that regard.

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You can sort all kinds of lists including out of state residential and commercial property owners...These lists would generally be under data searches on a county website. 

With the expansion of portal sites like ZTR (Zillow, trulia, realtor.com), the agent no longer controls the data.

I currently try to find as much comp data usign zillow, redfin, and findcompsnow.

I'm in the process of putting together the first of a quarterly industry report on vacation rental data, and I wanted to know what data you'd like to see. 

It's not an exact science, but it should reflect solid, real data.

Ideally you want a branded domain name that includes your target keyword(s), but still sounds like a brand name.Here's a good article with some supportive data: https://www.searchenginejournal.com/how-your-domain-name-will-impact-seo-social-media-marketing/Can you rank a site with no target keywords included?