I try to use DRK as much as my other jobs. Even in an ideal situation, that ends up as 1/7th of the time I play FFXI, which ain't much. I use DRK for fun things, for serious DD'ing I usually end up bringing my SAM. No offense to us DRK's but for absolute-pure-specific damage; a SAM with Hagun and capped Overwhelm is just silly-powerful. I see DRK as more of a utility-DD. Like, we can drain for ourselves, stun, etc. Also the ultimate zerger, but yeah - you require a specific event for that. That's why I use it for fun things, or when people dont specify a DD.
well sure it's not worth it if you never use your drk...
Besides, how often do you need acc reaallly. I don't have any equipments I could swap out for less acc (Homam? no Hauby+1? no). It's more for HNM, dynamis-northlands, meriting, idk.. other tough things. Stuff I use SAM or PLD for. Most of the time on DRK I'd rather HP than additional acc.