So my hope is to continue educating myself and eventually move away from purely passive approach.

Please man do not drive for dollars, don't do door knocking.You get a website and you do SEO.While you do SEO you do either PPC or FBads.Just so you have an image how powerful SEO is take a gander:This is purely organic.

My question is, should we be responsible for that $75 dollar service fee, for a simple battery replacement?

For instance, if you want pure appreciation expectation (AE) then i would out your window :)  NYC, San Francisco, Seattle, Boston, Miami, Honolulu, and maybe Denver and Austin.   

Without that, the rest is pure speculation. 

Process was pretty seamless as it was purely a cosmetic flip in an affordable yet highly desirable area.

So, my ARV estimate is truly based on my own research and pure guesstimation.

I ask the "have you caused delays" question purely as an internal exercise. 

This was a pure timing outcome.

If your focus is purely on the website, then they can certainly be a great option.