There is an extensive topic on this already here. Please continue the conversation over there as there's lots of information already.
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What are those looking like? ... Don't have chance to look but have fleet members asking.
General Recruitment (the basic DOff pack) - 1,000
Reassign Underperforming Officers (crunch 5 into 1 of the next higher quality)
Common - 500 (600 at race specific vendor)
Uncommon - 2500 (3000 at race specific vendor)
Rare - 5000 (6000 at race specific vendor)
Not a big deal, imo. 1000 dilithium is easy to get in the time it takes for the assignment to refresh (even lore quiz alone will suffice). And there are plenty of doffing ways to get blue and purple doffs, and the cost of reassignment fits with the costs of Ferra's doffs.
I very much doubt this is an attempt to grab for more dilithium purchases. They've said that zen sales are much more effective at this than dilithium sinks. It's probably just an attempt to keep doff value high by preventing massive alt-farming for the exchange.