I'm another Intigi cofounder. Great point on the freemium approach.

The reason we haven't pulled the trigger on this to date is twofold. First, we're a bootstrapped startup and we've been cautious about our burn rate (e.g., scaling infrastructure before we've achieved product/market fit and a sustainable revenue model). Second, for some time our product wasn't fully self-service. We were concerned about the support issues that would come with a significant growth in our user base, especially free users, potentially outside our target market.

We've now progressed beyond these two issues, and will launch a freemium model soon, with 1 or 2 interests and cached results that are updated once or twice per day.

I'd appreciate any other feedback, and happy to answer questions by email at mjfern@intigi.com.