With standard ceilings, and single-story I would expect to spend about $100k for basic turnkey on that addition with a hungry builder. 

All their units feature at least one whole wall of floor to ceiling windows and I could already dream of the lake and mountain views through them.

There were crack on ceiling above the kitchen and of course few walls too (interior and exterior). 

Height of the ceiling without floor is 6’ 10.

His solution was an offer to replace the fridge and the ceiling fan.

If scaling is truly impossible and you hit a ceiling at $80000-$90000 a year (figure I have got by googling "How much wholesalers make"), then it's indeed kind of a dead end a job with only benefit of working remote and making your own schedule, away from corporate world and office politics/nonsense.

Then told her to reverse her ceiling fan blade direction.

It needed all the systems and interior remodeled but the ceilings, beams and structure were solid.

I recently learned that popcorn ceilings made before around 1985 potentially contain asbestos.

For now, it's the basic ceiling dome lights but eventually I would add some more character... not necessarily for the ROI on rental amounts, but more so because I think it will help with the style.