As you all said, the various online lead sources are great, but Logan as you and Benjamin both mentioned, your own SOI/Database should always be your number one lead source.

The federal and state tax data bases share and compare data to each other, and many states share data with each other.

Not only should every investor do their own due diligence and their own math (not just napkin math, though that is useful for weeding out a lot of options) but they should have a ton of questions for any TK provider they consider and they should expect swift, data-based answers and a level of customer service that means that if they want to get on the phone and go through the math step by step, someone will happily do so in a timely manner.

Just wanted to chime in on this one...For any credentials a person claims to have, you just want to make sure that they are true (if they say they are a CPA, check your state Board of Accountancy; if they're an EA, check the IRS database).

@Wendell De Guzman  in your opinion is it worth it for you to spend $15 to get 1 buyer added to your database without any guarantees that they are just tire kickers? 

More specifically, I’m trying to compare the projected return of a potential SFH investment within a self directed IRA and the administrative burdens that come with that type of investment vs. simply investing that money into an REIT without having to set up a self directed IRA.

Some will charge a percentage each month but also a start-up fee, a leasing fee or lease renewal fee each year, administrative fees, maintenance fees, etc.

The only thing you pay for prior is an appraisal which is yours anyway, some lenders pay and work it into "administrative fees" at closing. 

We interview them routinely and maintain a database of responses to the most fundamental questions investors should be asking. 

What programs/software do you guys use to organize your network of
investors/cash buyers? Also is there any way to organize it by the zip
code they like to invest in so you can reach out to them by a specific
ni...