Honestly, most of the people I've talked with know about Google's business model. They give answers ranging around here abouts:
* I don't care about privacy; I have nothing to hide.
* DuckDuckGo are probably a honeypot; they gather as much or more information as Google, and lie about it.
* Even if I switch search engine, they'll probably get all my info some other way anyhow, and I don't have the skill or time to try to find everything that could be leaking information.
* Google supplies a better search engine, so it's worth it.
* Using DuckDuckGo as my search engine, when I'm using Android as my OS, seems like a waste of time, and I'm not buying a new phone.