It might be a good idea to page through the book to see if you like/want what's in it before buying it.
I think some people have enough trouble following directions for only one size, much less trying to follow something with multiple numbers in it.
How would you like the additional size information presented? As a separate listing for each size? Or like the knitting instructions with the optional sizes in parantheses? Would you like fewer patterns with more size options in a book?