Are Culls Worth It?

It's only worth if you plan to exclusively farm and never fight your laner more than poking. You lose gold when buying and selling dorans, whereas you only gain from cull, meaning it's essentially a free starter item.

Is cull any good?

Cull is not an efficient item in terms of base stats. ... As a result, selling the item in the mid-game only loses you the base stats of +3 Life on Hit and +7 AD. This means you have less to lose compared to selling its main counterpart Doran's Blade which relies on providing you the best stats.

Is cull a bad item?

Cull is considered a pretty greedy item, but if you can get away with it it's great. Most often top laners pick up a cull or dorans blade or sometimes both on one of their earlier backs to have more pressure in lane or alternatively make it through a tough lane matchup.