Well as Kurenai said, a DMM points Ticket deal is still cheaper then if you would to go with the 55x options (having to buy full batch of gems to do those pulls).

So RC coins and Tickets are now mostly for older girls who didnt have the 55x mechanic, plus new ones if you have no gems to do the pull.
If you stockpiled the gems though you are set.

Currently I have enough for 1 6* via the 55x mechanic (would have more but rolled before I read the rules... would have not wasted them on this girl otherwise and save up for some new Crit girl...... ah Valnut.... my sweat sweat Valnut *cry*sob*sob... will have to be burning RC coins to get her).