Meaning, if I’m paid $1200 and my mortgage is $800 I just pocket $400.

So, you're checking out BiggerPockets...that means you are at least 'interested' in learning more about real estate investing. 

I don't want to use a site that is going to mean increased competition.

So, you're checking out BiggerPockets...that means you are at least 'interested' in learning more about real estate investing.

Meaning, not your balance, but your available cash for the purchase.

If your clients potential property is not right on the corner or next to the corner with a cross through from the corner tenant then likely you are not getting much cross traffic from both roads of traffic.You also need to look at where the property is located.A road could have total traffic counts of 30,000 cars a day but that doesn't mean both sides of the road are equal.

Do you mean the buyer? 

In reality it means your living room is 6" wider than theirs, no extra rooms no extra fixtures....is that really worth $15,000 in the market?

That means that the NOI (Net Operating Income) of the entire property needs to be at least 30% higher than your loan payment each month.

If by investing in real estate, you mean purchasing a plot of land and sitting on it, this business model may serve you well.If you are considering investing in rental property, that is an asset type that is not well served by a 3rd party custodian.