Personally, I just don't feel like I'm being rewarded for the amount of time spent when it comes to the RNG system (or rather, the reward does not feel like it's worth my time/effort).


A system like tomestones could work though:

You get 1x Raid Tome at the end of a run and can have a maximum amount of [x] Tomes at any given time (x = the number of Tomes needed for the most expensive piece or per piece). You can spend these Tomes at a special vendor once per week, but if you've already obtained your loot from rolling then you won't be able to make any purchases til weekly reset - vice versa.
- Reason for capping the number of tomes so people can't farm it all in one week and just spend tomes at every other reset.
- I personally recommend 8 tomes max, I just don't see the Rabanastre gear (being non-upgradeable at 330) worth anymore than that.