how about this? it gets more points with each dice that's next to it
for those amount of dice and dice rollers I think yes it is the most efficient but after some time you'll notice that you will have too many dice rollers and not enough dice because of how the price scales. you want to use as few dice per dice roller and still use the three of a kind ability because it gives the most points. if you had infinite of both this would indeed be the most efficient but you don't.