I've been reading the PBE about Cull.
Now here's the thing. So far the item provides you 1 extra gold per each minion killed, and for a total of 100 minions, it rewards with an extra 300 amount, which makes it 400 gold reward, which is almost the same amount of money to buy this item.
Now, what if you sell it? How much is it worth selling? Would it be even less or more than the memorable early game item Doran's Blade? (440g buy cost - 176g sell cost)
Succesively I wonder, how does League calculate the sell values?