Supplementing a tenant rent is illogical.

Quote from @Luke Carl: Bigger Pockets San Diego October  I believe the STR supplemental (I cannot think of a better name for it) was full months ago and only symposiums are available. 

I have helped thousands of RE investors clients get business credit for RE investing since it's a great option for people looking to get started in RE, it's also great supplement for the seasoned investor looking to do more deals.

Ultimately, I want to use REI to put away money for retirement and to also have as a supplemental income.

I see myself slowly transitioning from full time rate race job in the next 5-10 years with real state supplementing other income.What are my next steps?

Meanwhile, they claim that a seller will be willing to supplement the monthly payment to (a) avoid trashing his credit and (b) participate in possible future appreciation.

I suspect some of those landlords who aren't already listing with services like Homesuite, will move there as a way to supplement lost business.

This is where consensus can supplement logic.

Those same colleagues worked past 65, many taking on menial jobs to supplement retirement.Then there was the bat house.

So you would need to supplement with deals that are looking to exit (and stagger them to exit, say every year or so...so you could benefit from the price appreciation boost).