Go to google and put the name of person / entity you are interested in the search engine, and then add the words "and scam".  

or scammed them on their application fee (like we're going to make a ton of money off those).

That strategy is not going to work at all. 99 percent of agents don't even know or understand seller financing and will just think it's a scam (which it is most times these calls come in since the caller has no money and therefore is irrelevant to a regular homeowner).

Most of the people I know that tried it realized you need to devote all of your time to one or the other to be successful.

Either the property was already rented, or it's a scam.

You can see plenty of examples in these threads, where every contribution revolves around this same promotional angle:https://www.biggerpockets.com/forums/927/topics/1195612-the-...https://www.biggerpockets.com/forums/311/topics/1136123-what...https://www.biggerpockets.com/forums/48/topics/1103837-which...https://www.biggerpockets.com/forums/62/topics/1156841-scam-...https://www.biggerpockets.com/forums/44/topics/1159791-what-...https://www.biggerpockets.com/forums/79/topics/1121289-has-a...https://www.biggerpockets.com/forums/44/topics/1159791-what-...https://www.biggerpockets.com/forums/79/topics/32290-jack-bo...https://www.biggerpockets.com/forums/12/topics/938096-land-f...Given this pattern and the sophisticated marketing approach, I wouldn’t be surprised if "William Ferr" might actually be Jonathan Halves himself, or someone closely tied to his business.

Between the contractor that scammed me and the break in, this project has gone on for about five months longer than it should, and I have depleted my savings making the interest payments all the way up until I have zero money. 

Research competition  and determine their profitability and how much they spend on marketing, how many employees they need, and how much time the wholesaler needs to devote to the business.  

I THINK IT'S A SCAM.  

He is a scam.