The cost to maintain them probably wouldn’t be exactly 8x as compared to the single 8-unit, but it sure as hell isn’t a 1-to-1 ratio either. 

In a situation where you were doing an arbitrage (renting it from the owner, then yourself re-renting it to someone else) your costs to renovate/fix it up while you're using it would be able to be capitalized and depreciated by you once your rental was in service (available for rent to others). 

The most important thing for you to learn as a wholesaler is repair costs.

Good summary of what your market is looking for but as we all know, each market tends to have its "wish / want" items which differ from market to market.Flow is definitely a selling point but make adjustments come with a cost. 

2 or 3 bedroom properties would be more profitable considering their cost?

It's the cash you put in that's your cost for the property. 

We were shocked at the cost of goods, lumber, cabinets, paint, plumbing.

I see hard money lending as just part of the cost when doing these kinds of deals.

Quote from @Celli Mowery: As a BP binge listener, investor and agent, I'm curious why smaller areas of Kentucky are not receiving focus with their low land costs, & lower entry points?

Why is your mortgage cost so low at only $44k/year?