You're just paying for leads.

Those companies will die out and the emerging ones who lead with quality sourcing/underwriting & have real estate experts at the helm will grow the market in my opinion. 

I'm currently using a PPC company, which has been generating leads and has been very productive so far, but I'm looking to add to our marketing funnel and bring in more leads.

I highly second @Kwame Amoako and recommend starting with a off market direct to seller campaign to generate some leads. 

Why do you want to star investing in real estate, and what strategy will help you achieve your goals, two questions that will lead to more clarityGino

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.

The first CPA I worked for told me that tax preparers who are unconfident would print every page generated by the tax software, to make a return look bigger even though it was bloated with unnecesaey supplemental sheets that provided little to no value.

A good agent can not only point out things you might not notice/know to look for in the experience, but also should help lead you to strategic advantages.

The areas I'm searching now for properties are serving all three audiences well, so my next step is going to be looking for inroads to the corporate people who lead the relocation set up / contracts so as to be their Property-of-Choice. ;-)Many thanks!

I'd want it to be able to generate P&Ls and Balance sheets for separate properties, and be able to accommodate multiple LLCs on one login.