Owner financed offers on my listings

[Dustin Lunceford]

I have had a good bit of investment property listed over the last year.  I have recently received calls/verbal offers on a few of my properties that have me scratching my head.  Each of these offers has been $20,000-30,000 over the asking price with owner financing.  I have asked if someone is teaching this offer structure and one person said it's common in land and the other explained it as a win-win situation.  I asked questions of the win-win buyer and after a little back and forth, it seemed like the buyer is just overpaying for the property to get owner financing.  My two question are:

Have other agents had similar type offers on any listings? 
What am I missing that makes this a desireable offer structure?