This problem will go away for some time after 7.0 comes out.

Level 90 Augmented Tomestone gear will switch to poetics giving many players plenty of gearsets/weapons to buy if they didn't grind capped tomestones and hunt marks (or raids) in 6.5/6.6. Also, the various Manderville weapon stages will all require poetics to some extent to finish them. That is a huge tomes sink that will last some time.