I'm not sure how you would deal with that. I think there should be some clarity as to whether or not that's permitted under the current framework. I think the 10% rule is a little bit different in this context, because you're not giving 10% of the book to a student or to another person and saying, “Don't buy the book”. It's not a substitute for the original intent of that work. Ideally you want more than just 10 poems. You want every poem in the world if possible.
That's the diversity, particularly looking at translations and what have you. If you're only looking at one poem or a set of poems and saying that this is what is good but all of those poems are created by one type of person, then that notion of what's good or what has a happy sentiment is flawed or biased because you don't have access to a larger training set.