I've got a mid-grade FF#52 also missing an ad page (story unaffected). I also got a substantial discount on it. Do I want to buy a low grader just to marry them? No, I'm more than happy to have it in my collection so I can read it and enjoy but I'm a collector.
I've given my advice. Take it or not but I can see you losing out on any marrying ideas. To get a price you will be happy with, the book will have to be slabbed and it'll come back purple which is self-defeating to any notion of achieving the highest price possible. If you try to sell it raw honestly, then it's probably not going to make much more than you paid for it (and the bride). Do you really want all that hassle?