Personally I don't think it needs a buff.
If you've decent gear (Bp + elite void) a kill might take you an average of 1,5 mins which is pretty quick tbf.
Let's say you get rewarded with approximately 60-80 pkp each kill, that's like 2,8-3k pr hour (Zcales and other drops from the rare droptable excluded) which is pretty good imo.
But if you're using RCB in spawn gear it might feel a little long-drawn.
I think it's one of the best money making methods rn on Roatz and it should definitely stay like that.