yes the are a bug in many C4 server with GMshop =)
Buy 'The bow or the staff' then enchant it to +7, now when you break it, the sell price of S grade crystals is higher than the staff price ^^
PS: in my server the staff = 35kk (when you buy), scroll = 750k (when you buy) , and 1 S grade crystal = 12,5k (when you sell it).
Sorry for my english.