I've been closely monitoring my progress for a book (7th Heaven by James Patterson) for several months now and I've consistently moved 1-4 slots a day for the past few months.  I don't think a day went by when I didn't move down the list towards number 1.  However, I've been stuck at #16 for the past three days.  Now, I know, I know!  Maybe nobody has posted a copy in the last three days!  I realize this.  I'm just wondering if any of the other obsessive wishlist watchers have noticed a lack of movement in the last few days (since all of the amazing upgrading was done) on a popular book that had previously seen movement on a daily basis. 

I am also an obsessive wishlist watcher--at least every other day!-- and I did see movement on some of my books between Tuesday night and last night.  So, maybe it's like you said and noone posted a copy in the last few days.