Overall, it can be a profitable business, but most people get into it to become an investor and 99 percent fail right away because they don't know the slightest thing about repair costs, talking to sellers, and are only in it for the money and not to help people.

Ive seen many attempt to DIY on their own form a distance and fail.  

And in second, setting up a "plan Z" where if all else fails what does get "burned to the ground" is replaceable, and the wealth center is protected on it's "asset island". 

If he failed to pay, it could be construed to be a failure of consideration so the deed fails and she's still in title with him and all he can convey is his half. 

Some are basically renting out bed space and require tenants to sign an agreement to stay clean, and be tested upon request, with failing the test potentially leading to immediate eviction.

The reason why most investors fail is because they are not properly capitalized.

It can become a really big mess and lot's of them failed the last downturn.

You fail that test as well. 

Had strict timeline for delivery, they failed that too.

Have them pay the repair company before closing with that much of your earnest money going hard in case you fail to close.