What's the expected research effort show by an asker in their question?
I'm not asking about close votes! But normal up and downvotes based on the research level of a question. That's all.
And why would there be? Just look around. Many of our best, most viewed and best answered questions come from simple, clear and completely unresearched questions.
I've dallied around this in previous iterations of this answer but it's really that simple. There's probably a positive correlation between question quality and amount of research but I don't see that it's causative. Just as you can have great questions with no research, you can have a thoroughly researched question that's still pretty crap.
Explaining the problem is way more important than demanding some sort of proof of having already searched for an answer.
So forget "research" and focus on the core question quality.