Although in theory they are protecting your interests, the reality is they sometimes cut corners to get a tenant, sometimes MARGINAL tenants, into your rental!

I was wondering if seller financing could be a way to give my brother a better price and my mother more profit.  

There are a lot of people like @Paul Sandhu mentioned, making calls to owners and agents to lease and re-lease or sublease these properties, and there are management companies as well that can assist with furnishing, eys and turning it over for cleaning between stays. but again I think that owning the building, make this model more obtainable and profitable. 

To make it work with a decent profit would require a significant counter.  

Sure as time goes on you may develop a basic understanding of Facebook ads, but if you have an advertiser implementing things you aren't used to or haven't heard of, you might not know if he is actually doing things correctly.Ultimately everything needs to come down to profit.

My main focus is just wondering which might make more profit on the short and long term you know as In monthly income and Also over all winnings .

At the end of escrow, I will get close to 300K but out of which $15 to 20K is the profit.  

Also, how much profit would you have to give up for the discounted contractor rate?

Profit in real estate comes from cash flow, appreciation, and principal reduction...cash flow is only one component of it. 

When we close we will end up with about a bit over 5k profit on the house.