Regarding the ad page missing, you are correct that CGC will usually assign a Qualified grade, however, at the very lower grades they probably won't. I think your book would get a Blue label with notation on the label stating such. However, it will impact the grade even farther. IMO, with the missing ad page, this book would struggle to even get a 3.0. I think we are now in 2.0 range.
Regarding Marvel chipping, that is something that happened during production, came on the shelves that way. The 'chips' missing from your book is due to handling wear, inflicted after production.
I would not get this book graded. It's really just a reading copy.