If my group has a dedicated healer, I'll toss some nukes to keep busy (and a little residual skill up is always nice). It's just that I play with RL friends and family, and more often than not I'm main healing on RDM with them. I get to melee RDM with my wife when we duo, but that's the only time outside of solo.
As an aside, I do incorporate nukes into my melee, usually at the start of the fight instead of just DoT pulling. I get around 900-1k on Blizz IV depending on the mob, which is around what my WS's do, so it's like a free WS. It's mostly when I'm soloing magian trials, which is why my skill is decent but not capped.
I should get around to working on my nuking more, but currently I'm gearing for 5 jobs, and nuking just isn't a priority.