I have used deal machine and prop stream as my primary apps.

From the videos I watched on YouTube looks like a lot of people have had success with Rustoleum countertop paint around $22.00 at Lowes and Behr Alkyd Semi-gloss enamel paint for the cabinets around $35.99 We painted the cabinets in our old house white and used a high gloss for the cabinets because it was easier to clean spills from the kitchen.

I've heard of list source and prop stream just based off of BP podcasts and their books. 

In our area, some agents aren't single agents because their brokers don't allow it, and some (many) will spill all the beans regardless of representation. 

Something to thing about as you look for streams of passive income in the future.

Example: I have a fourplex with a finished basement that is converted into a AB&B that gets 30 dollars a night: however I don't rely on the AB&B for main stream income its meant to offset vacancy.

I have also found that if you can create a demonstrable VR income stream, you can sell at a higher price to those who are looking for a self-funding vacation home.

If you choose a particular marketing stream, and do it consistently overtime, you'll get leads.

Yes, it's a business that ultimately creates passive streams of income.

They may not even get approved and may have to do this over and over....IMO doing they work of reviewing an application is cost of doing business and should  not be a revenue stream item.