I'd estimate that there are less than 1,000 legitimate, or "professional" wholesalers, in the United States of America, as defined by individuals who make $100K flipping contracts, and collecting assignment fees, in any form, and who have made that amount of income more than 3 years in a row.

This allows participating in the $1.1 M equity with a ROI of 100% and on going 25% annually with the historical appreciation over 30 years of 8% a year. ( Zillow stated a 10.4 % in the last 30 days $251,361 ).

Spoke with multiple credit unions and they mentioned a rental property needs to show at least two years of rental income in order for that income to be counted into the DTI ratio. 

After five years you'll have earned $90,000 in rent income and gained $34,000 in appreciation.Buy four houses with $50,000 down on each.

Some, like James Dainard, emphasize an annualized cash-on-cash (COC) return of 60%-80%.

Fun fact: best ROI in the annual Cost vs Value report is a garage door.

They are not experienced real estate investors, they are retired and looking to create additional income. 

50k to 60k gross rental income?

A real rough back-of-the-napkin metric I use is if a Colorado property's gross annual STR revenues can equal 10% of the purchase price.

Do they have other sources of income for retirement?