The OP made the call as a founder who deeply cares and is trying to make a connection with the person on the other end of the line. In your experiment, the calls were being made by staff of a third party, which raises concern as to whether the caller is interested, speaks with appropriate animation and can evoke needed interest and emotion by the receiver of the call.

Furthermore, I don't think the value proposition of your scripted pitch was significant enough. The OP went out of the way to try to create a valuable win-win scenario without it sounding like a sales pitch. If I were on the receiving end of your script and didn't know of your organization, I'd assume the ebook would be filled a bunch of fluff and a hidden sales pitch for your product. Potential value for information that I couldn't just otherwise find on Google is low.