I spent around 2k in Great Plates and got 2k bp boost AND72 Kushina frags AND 8 MM frags AND 6 Shisui frags.

24k in Great Plates will give you nearly a 8k bp boost at least.

For the ninjas tho, you will quickly see which ninja you are having the highest drop rate of.

Shisui is definitely worth getting.

He costs like 12k max from Lucky Board so you can get Shisui AND have a major bp boost.