(you can dig up the seattle times article,  I'm too lazy)FWIW I am in the process of closing on a new primary residence for myself in upper Rainier Beach  (2300sf 2 story mid century,  $430k, mid block on residential street, needs a little spit and polish, but totally habitable).  

My understanding is that it is reasonable to charge for anything bigger than a basic nail hole. 

Trim carpentry like door casing or base boards you want to see mitered corners meet proper and all nail heads have been puddied proper & caulking is done so that paint shows a good job was done period by the trim carpenter...Floating floor systems or laminate flooring should be connected joint to jount proper & heads up find the dips in the floor first and float them out so you dont have it show in the end. 

@Joel Owens hit all of the nails on their head with his very comprehensive post.  

I think you have hit the nail on the head about where do you start but you have to start somewhere.

You need a utility knife, hammer, small flat bar, nail gun will help (everyone should have one), sharp chisel to remove old paint and caulk, caulk, caulk gun.  

Next, fraud is rampant in app's nowadays, in last couple years it's gone WAY up in volume of occurrences, but also gotten far more "polished" in skill of such.

Polished concrete floors.  

You can also look at the JSO for an idea of the types of crimes in an area...Once you have this, you can begin to nail down where you wish to invest.

Trying to nail this down as I see a lot of upcoming potential to help a lot of people out doing this