You are paying 4pts to increase from 75% to 94% of damage per die.
Assuming you arent fishing for crits, or have screed/vader, that doesnt seem like great value to me.
No, no. You're paying 4 points to increase the average damage output of each die from 1 to 1.25. Making your *average* roll of four dice the same as if you had rolled 5. This is the cheapest damage output increase in the game. As an example, Rapid Reload costs 8 for one die per side facing and Expanded Launchers costs 6.5 per die to the front only. Since Rapid Reload cannot realistically get both hull zones to hit the same target in most situations, we acknowledge that it is closer to fill cost per die.
Also the benefit of higher damage output is non-linear (can I get enough damage to kill that ship?), so one also needs to look at the probability of getting at least X damage and OE raises it significantly.