Because they can typically close quicker.  

Do you need a quicker closing date, or does your client need to rent back?" 

I wouldn't mind having it just to see if I could find a salaried position because then I can use a guarantee or welcome letter and my first pay stub as proof of income for my lender and get in a lot quicker.

If you're doing your own Zillow/Redfin homework, and it is a quick sale, then it could be tremendously quicker and cheaper.

That gives them the feel that you know what you are talking about and are experienced in the field, the close will take place a lot quicker than traditional financing, and that you have cash on hand to have skin in the game. 

They want ‘quicker’ rehabs and returns so they can get their money in and out of the deal.

- Are there any other products or methods that we can have access to cash quicker than a 30-40 day period that the refi requires?

It isn't necessarily about positive cash-flow right away but more-so a way to build equity and keep living costs down, allowing either a better quality of life, or as a means to save money quicker for the next investment or goal.While a single-family house-hack in our area won't likely cash-flow, there's something to be said about the appreciation over the time you expect to hold the property, and for what use. 

As it relates to wages there is one mathmatical problem that the Fed can't outrun:Since 1980 we have had less kids than ever before and even usually less than 2 per couple which creates a quicker downturn.

When you have a property that is legal is valued 5-8% higher and will always sell quicker.