As a buyer and someone who does wholesale when properties that don't fit our buy box come through our pipeline, I don't ever count other people's pockets as long as the deal makes sense to me, than why worry how much someone else is making on it.

You do not even have to borrow the funds  for rehab, and rather use someone else's money for the acquisition then use your funds to rehab the place.

Feel free to reach out if you need anything else.

Make sure your listing description is detailed, catchy, and easy to read (not just a jumbled mess of a paragraph)3.

Where else can you earn 6%+ and have immediate access to your funds when needed?

Try to be accommodating to their schedule, try not to make a mess, try to respect their right to quiet enjoyment.

There have been some famous scientific studies that showed people were far more likely to want someone else knocked down to size than for themselves to be lifted higher if they perceived a situation was unfair.

I don't know that and neither does anyone else here. 

Anywhere else I'd recommend a regular fence that'll be low cost and efficient

So if your ARV is a a 500k home that will be consistent with everything else around it.