Depends on the seller and the buyer, most people sell and buys them very cheap atm, but some there actually know that how valuable it actually is gives up to 10k just for a pick with silktouch, but eh, i've seen them for 4-8k
With all of the Xp grinders people have now days there is so much enchanted items out there that it's probably only worth 2,500r. Plus with the new update the enchant limit will probably be 30 levels and if you enchant above level 10 you will almost always get two enchants on it.
