It's interesting that they tell you the boost has an RO, but if you take a promo code bonus on top of the boost it seems to negate the boost RO.
For example, I recently deposited and took the 10% boost and the 35% crypto fp. So that's $1,450 of combined cash and FP in my account. My RO is about 16k. Not sure how exactly they come to that number but it's not 20x, actually a lot closer to 10x.