A wishlist is essentially just a bookmark to me.

However, I have never gotten an ebot/email informing me of a sale. If I had, and the sale price was decent, I would probably buy more stuff.
On the other hand, if I was getting flooded by ebots, as Acadia, I would probably trim my list way back or ditch the whole thing anyway.

Getting people to part with their money isn't easy. :-)