Property owner is financing a relative/friendOtherwise, a seller can sell to a buyer able to get conventional financing and cash outIn certain instances, an owner may be willing to owner finance even if the above conditions are not true.  

I rarely wear a name tag nor distribute business cards.

John,you can not order them off the premises but,you can encourage them to go out to lunch or do errands while the inspection is taking place.Give them a written notice on exactly when you will arrive and depart the property and suggest they find something else to do because the inspection will be hectic and disruptive to them.Offer them a gift card to Olive Garden or something to pay for lunch.

It's not like a loan gets paid to the seller in installments over time or can be reversed like a credit card charge, once it's approved, the seller gets the full amount and it's sold, right?

I wish the statement above was true across the board!  

Many applications I reviewed while developing mine asked potential tenants for bank and credit card account numbers and balances.  

You don't have a bank holding all the cards in the deck.  

@Andrew Nelsonwhat @Gail Kaitschuck said is true in Baltimore also.

That's a good point when looking at a true appraisal, but I still value all my properties using cap rates and ROI.  

"It never hurts to ask"  Has really held true.