In other words, you can buy a quick potion & the effect of ruthless raid mixing, instead of SP. In fact, the difference is not very big. It's a quick potion plus 400 to quickly improve DPS. You can use FB when you bring BOSS.
When I hit 1200 dharma damage 30 crit 16 and hit 14 quickly, I just drank the DPS of the potion food pile.
By the way, where are you from?