I know that others will disagree, but I struggle to justify the cost of any concierge cabin on DCL. I do understand the perks, and if the difference was 1k or so - I may be tempted. We've sailed 5 times on DCL, and also on Crystal (rip, was our favorite) and Regent. Both Crystal and Regent were fully inclusive with no additional charges - included gratuities, specialty restaurants, unlimited drinks, premium wines, and champagne - and even included airfare, transfers, excursions, and a pre-cruise hotel on Regent. Plus, ships with <600 passengers!
For most itineraries I've seen, on a per-night basis, DCL concierge is even more expensive than those ultra, ultra-luxury lines - which makes it hard for me to justify. And...we've had such great experiences and service sailing in standard veranda cabins on DCL, for us, it's an easy choice. Again, I know that others see it differently, but that's my perspective - and hope it's helpful.