I don't think one should get or lose reputation from example questions. Example questions are meant to define a proposal:
Discussing whether questions are on-topic or off-topic helps figure out what the site is about, and, more importantly, what it's not about.
I sometimes wanted to show a proposal that they really don't want a certain question, but didn't post it because it would get downvoted, probably. However, the quote says that downvoted questions are useful too, even more important. So why take a user's rep when he substantially contributes to a proposal by asking questions that would be off topic?
To avoid people asking questions that have absolutely nothing to do with the proposal, we can use flags to get them removed.
What do you say?