Once a week because they tend to get into feeding strikes?
Working with Boas, I know for a fact that less is more... and big meals every 2 weeks for adult females and 4-5 weeks for males gets wonderful results... and Boas are a deal more active than BP's.
This is further proved by BHB's experiment which showed how baby cornsnakes from the same clutch reacted to different feeding regiments... the ones that ate more, per greater length of time, were the ones to grow most considerably.
What stands behind the recommendation to feed boids(in this case, BP's) at a rate you'd feed a cornsnake(colubrid)?