The ground work for this is in game it’s just up to a.net to put it in the game… Most people have issues farming t6 materials and lodestones and that’s causing a ton of unrest in game and on the forums… The simple solution would be stepping back and taking a look at what you did right with guild wars 1.
Rare material crafters throughout the world who would ask something like this 1xpowerful blood = 5 potent blood + 1 incandescent dust and 1 silver…… That is a very easy thing that could be done for a reasonable amount of time…. It would up the prices of t5 mats but it’s not that hard to get t5 materials as it is…
For the collectors the ground work is in game as it stands and I’ll use this example… Players try to farm corrupted lodestones off of icebrood… All ice brood have a moderate chance to drop Icy stones which could easily be a collector item… I mean 25-30 per 1 lodestone is reasonable since it takes around 1 hour of farming to get that… It would allow those who have absolute 0 luck with drop rates on them to still be making somewhat steady progress to goals…
Step back and look at past success from gw1 and figure out how to put it in gw2… That’s your best bet to alleviate player tension from bad drops… I mean look gw1 had horrid drops but you could go to a collector/rare material maker and get things in reasonable time without spending 12+ hours a day with 0 progress.