I haven’t seen it personally but I imagine it’s some kind of “use us to sell or pay a penalty” clause. 

Come by REI Central some time if you want to meet other investors in person.

It is extremely hard for the average person to afford a standard home, car, and investment property without any debt.

can you visit them in person? 

It's tough for me to answer on a learning curve question I went to high school for architecture and college for construction management and I've never personally flipped a house, although I know how to budget and schedule it.

I probably will not renew with this person.2.

If that person want profit from each deal going along, you can make agreement with each deal you are doing. 

Or you could buy a property from another person at the meetup.

The person who owned it before me filed an affidavit of correction for a mortgage he had on the property and referenced an instrument number that had the wrong legal description.

From personal experience, MLS deals are much less lucrative given their higher price points (typically).With respect to financing, you can talk to any of the hard money lenders on this site for different financing programs they offer (some are tighter with someone who has not yet executed a flip), you can take equity out on existing properties you have, you can use private loan from a friend or relative.