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Those would be better as "how many" questions including a "never" option. Yes/no polls aren't very interesting.
While I personally find yes/no polls interesting, it's true not everyone does.
I think the first one especially could turn in to a how much question. While I liked my have you ever paid for manga wording, because it covered the rental sites (like netcomics) & magazines too, but it's probably a small percentage that only ever paid for comics using them.
How much manga/manhwa/doujin volumes have actually bought (physical or digital)?
More than 200
100-200
50-100
25-50
10-25
5-10
2-5
once.
never.
I'm not sure if those are the best groupings. And while I think it's better to go by individual volumes maybe going by series is better. If you only ever bought 1 series but bought all 10 volumes of it should that count as 10 or 1?