Before the new castles came out. You could place the old ones on shards besides Alt. You could not even give castles away on some of the shards.
Right before the new castles came out. People started placeing them in the Hope's that the market would turn. Before they where worthless and now some people are selling them for 200mil and up.
On alt the new castles have pretty much doubled the price for them. Seen castles that could not be converted drop in price and ones that could doubled. Was offered 5plat for mine before the new ones came out and now have a offer of 10plat. Eather way I wont sell. Only way the castle is leaveing my account is if i pass away or get hacked.