How Are You Using Rank-Up Resources?

Just curious how other people feel about this, but as someone who's Paragon and on the verge of becoming Valliant (I'm one Necropolis path away now that I've explored Act 8), I've decided that I don't want to use catalysts on 6-stars anymore. Rank-Up Gems are seemingly more and more common, and when Rank 4 7-stars are introduced to the game, 6-stars are going to be left behind.
The only 6-stars I plan on ranking up any time soon are Kate for Necropolis and maybe Bullseye for Battlegrounds, and both of those can go all the way to rank 5 using rank up gems.
The only 6-stars I plan on ranking up any time soon are Kate for Necropolis and maybe Bullseye for Battlegrounds, and both of those can go all the way to rank 5 using rank up gems.
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I'm sitting on 3 generic 6r5 gems but can't pull the trigger since my favorite r4s are in the 7 pool.
It just so happens that the game isn't too far ahead in terms of r4's not being useful, so there's nothing wrong with using the gem-only rank up strategy.
I just used catalysts to take AA up to r5 because the only mutant I have that's even close to worthy of r2 is an unduoed domino and I will not take her up until I dupe her, and AA is a killer, and not likely to be a 7* anytime soon.