This question has at least 2 sides to it. Shrek does not come up for sale often, and seems to always command a price tag north of $4K. With 300 plays and looking NIB, I would put it more like $4500 and on Pinside, it wouldn't surprise me one bit to see someone asking $5K for it.
That said, I have a feeling many people here do not think Shrek, in any condition, is worth $5K or even $4K, but that is totally a matter of personal taste.