Lets just say worst case scenario you spend your 20's working hard, living lean, and investing every extra dollar.

Use the "extra" income to build a reserve for maintenance, vacancies, and other expenses that don't happen regularly.

We do get a better fee/split structure, and that's a fair trade for the extra work of managing a large investor base and it's associated extra accounting and tax reporting overhead.I also find the advice in the OP to be contradictory. 

Well, do they have a job to pay that extra $200 plus utilities per month?  

Retail and data center REITs lead, with Realty Income and Digital Realty Trust among top fundraisers.While REITs raised significant capital, property acquisitions have slowed, with more sales than purchases recorded.

At a minimum you can put your extra funds into a high yield savings account, or even better 4-week treasury bills that give you state tax exemption and keeps you liquid for your next acquisition.

Over the past three years, I’ve been using most of the major off-market techniques.One standout method has always been pulling data and feeding it into a call center to generate off-market leads.

Consider how it will be used and if the floor can function as storage, rec room, family room, extra sleeping space, etc.From what you've shared, my concern would be the "hills" that may cause a tripping issue.

You could automate underwriting pretty easily, as well as scraping and feeding data into an underwriting AI.

Keep the comparable data just in case.