ask yourself this. do you really need that extra turn in the boat from repeat? you know the drawback of it and it's not like you're going to try and get a delay in a boat.
Depends on your selection of pearl. Some pearls are meant to make the pow a one turn kill gig in pvp fights. Not everyone goes for if i get a extra turn i can do .... Fewer turns it takes the less time spent doing it whether it be fight or boat.
Other pearls that are pvp specific you can find ways to use them in boats too if you are willing to learn where they work and on what enemies.
For example: Ice pearl works great on bombs and non armored minions. Ie it won't work against sick chicks, tribal warriors.
That's what you'd expect from an effect pearl. Don't go relying on your pearl for another w/e it's supposed to do. (variant depending on the one you put on) It's there to help you not be your crutch O.o
A damage pearl well you got much more leeway depending on what you know the pearl does and how it can be used to best of one turn. NOT TWO. Quality or quantity which is better guys?