If not, does this need to be subtracted from your sale price?

If a house I'm interested in is valued at $100k, I'd take 70% of that ($70k) and then subtract whatever repairs are needed (say $10k), and that would be the price I offer to the buyer ($60k); so the price I offer to the seller would be less than that (say $50k) and that's where I would profit?

The value of our money is going down in attempt to keep prices from dropping (in nominal terms) but the effect does not in fact add value anywhere, it subtracts it!

Then subtract the rehab costs from the 70% of ARV number and you have the maximum you should spend to purchase the property ($140,000 - $40,000 = $100,000).

If it's a flip, I add 10% to the rehab costs and subtract 10% from the ARV.

Next figure out what your monthly payments for principal ind interest are and subtract that from half the rent.

I am then subtracting my mortgage (principal + interest) payment from my NOI to get my below the line NOI or cashflow. 

The constant drumbeat of payoffs will result in you spending a lot of time on paperwork to originate loans and facilitate releases, plus servicing costs (subtract that from your return too!)

If you know the gross rent roll, subtract NOI and see if the expenses seem legitimate.

Being a renter previously, I’m saving an additional $1250 every month by not having to pay rent/mortgage, so I was actually subtracting the money for repairs from there.