Oh, most definitely I've noticed it, especially in the last three or so years. Like you and Nekarose have said, a lack of copyediting is not necessarily a commentary on the author or the book, but part of the conditions of production in bookland. Even so, it's disheartening to see the way it does vary between imprints, publishers, and even authors, because it seems to me that this is a known problem, one that, rather than solving, just gets pushed to places and people the publishing powers that be care about less.