People being able to sell Sugar Cane 16 for $5 is just going to have people AFK and make auto sugar cane farms. They'll AFK and make a ton of money after sleeping/working/not playing. I suggest Sugar Cane price should be 16 for $2.
Let's just say for a second I spent $60 and paid for my WoW account to start playing at level 100. Then the game releases a new expansion and the new level cap is 120. Since I paid $60 to start playing at max level ($100) should I then automatically be level 120 at the new release?
Imagine...
If the server gave you a refund, you could just buy them on the new server - I.E. a transfer. Imagine people with millions of claimblocks starting on a new server that's only 10k by 10k.
Maybe suggest a partial refund?