I think a poll isn't the best way to decide this issue. After all the problem you're trying to fix is the greater number of low-quality comment, i.e. those who

I think a poll isn't the best way to decide this issue. After all the problem you're trying to fix is the greater number of low-quality comment, i.e. those who provide low-quality comments outnumber those who provide high-quality comments. Thus, it is not unreasonable that the low-quality commenters would select the option that enables them the most.