For future tenants, do not give your home address if you don't want potential visitors.

You will be paying a premium price and likely, if it is a SFH, will not be suitable as a rental.

The numbers in the tool are as reliable as the data chosen to perform the analysis, and that is up to you, not the software.The tool currently uses Zillow data to suggest a number of comps for you, however you still have do the work of verifying their suitability for your analysis.

Last year, it welcomed 72 million visitors. 

In that value prop, you are conveying the sense of urgency that your ideal visitor should show.

There is preset minimum screening but also a discretion about who in general would be suitable tenants that would go beyond the numbers.

Read about both professions, interview people in such professions already about their daily lives and then decide for yourself which one is more suitable for your personality.

His POV is you have to make a home a dream home with high design touches to get repeat visitors (which I agree).

Has anyone heard about buying islands and developing the land to make it suitable for developing homes etc...?

My recommendation would be to make a unique link to a page that redirects your visitors to whatever page it is you want them to go to and then using tracking software like Google Analytics to see what kinds of traffic are coming from your article(s).