My experience this year as seller...I'm guessing maybe 50% give me feedback. I don't even ask for it. Personally, I don't really care as long as it's not negative as I've been on eBay
I don't trust feedback unless there's a ton of it.
Not naming names, but there's been a seller of "stuff" selling 4-6 US forever stamps at less than face value shipped and messaging to make sure you send feedback. Gaming the system at little cost.