I just bought recently a spirit weapon for mage lvl 8 (now lvl17) or something for 300k (was thinking about to sell it in the auction) but is it worth it to lvl up it because when i look at the xp count for lvl 28 its pretty high but for lvl 46 it's probably a 10x higher but is it worth it to lvl up or should i just sell it in the auction