I know that Stan Lee Signature Series copies of this book can sell for good money (there's another $1000 sale out there) but this seems like an aggressive price. I know that Signature Series books, especially with creators who are no longer with us, can be unpredictable, but this one seems like a little bit of an outlier. I can't help but but wonder if the way the title is worded is confusing people into thinking this book is signed and sketched by Ditko. You can easily read it as "Ditko Signed & Head Sketched" where it's really meant to be read as "Ditko [cover] Signed & Head Sketched [by] Stan Lee."
Amazing Spiderman #700 Ditko Signed & Head Sketched Stan Lee on B'Day CGC 9.8 SS | eBay