Got a idea: Xp rate Runecrafting = 63k Xp rate Agility = 72k Profit/h Runecrafting = 500k Profit/h Agility = 0 Lamps from Slayer = 1870 Xp from DK lamps from effigys: 89800k Time saved using DK lamps on Runecrafting: 89800k/63k= 1400 hours Time saved using DK lamps on Agility: 89800k/72k= 1250 hours For saving 150 hours, you are wasting 700m profit. So, 700m profit made/150 hours that you would waste= 4700k profit/hour wasted I guess that If you don't value your time over 4700k cash/hr, you shouldn't effigy Runecrafting.