This is one of these very simple yet useful ideas. It's much more likely my subscribers will respond to one question by clicking than by having to reply my email.
I appreciate that. We're all busy and don't have time to answer 25 question surveys (or even 5) and I pretty much never answer surveys unless I'm head over heels about the company/product like Evernote. (Sorry for the delay, HN seems to be limiting how quickly I can respond to people).