You have to be very active and have all slayer girls and you base SED have to be high and have power full friends and maybe use macro.
If I had all slayer cards I would do 2-3 mill damage with small hits.
One hit evey 5 min (if you not use items) give one kill - If boss dont die after one small hit send it to you big friends that all so small hit for 2-3 mill each too.
So 300 kill per day is posible if you play 24 hours non stop even without spending items.
Players who play 24 hours per day mostly use macros.
Non marco users will not get more than 150 per day unless the spend restore items.

Spending 100$ can also get you 600 kills too - so it is hard to seen if a player use macro or just spend 40 $.

I have 250 kill atm without using macro and have not been so active - topplayer have 750 kills which is posible without macro too.

Using Macro is not allowed in PP ofcause and have lead to flame wars where some players claim other players are cheaters.