That's quite a ripoff for the old Nexus 10. I guess they will launch the refresh soon and try to clear old stock here.
If you consider N5, which is selling for 28999 and is actually only for $350, the N10 is actually for $400 so I ts quite considerate. Also people saying that they are going to clear stock and n India, the N10 has been out of stock in the US for more than 3 months, so actually they don't need to clear any stock.