Guild Wars 2

I have been noticing a trend lately and it is not until now that I choose to say something.

I have been playing this game since launch, and have enjoyed playing it but the one thing that bothers me is my time spent vs the reward earned.

I will constantly play with the same group of people almost every day with few days excluded, and what I have noticed/my theory is I must have some sort of unintended/ bugged diminishing returns associated with my account.

For example in a 6 hour gaming session I will earn maybe (without bosses)
1 or 2 rares per 3 hours if that (most days I receive none), meanwhile someone else will have pulled 4 exotics…(which i only see maybe one or two in a 2 month period) and this occurs on a daily basis. Every day I play I usually only receive “Grey” loot or no drop at all from the hundreds literally hundreds of enemies I kill, the exception being the few and far between greens and somewhat more prevalent blues. This bothers me as a lot of the people I play with seem to think that either:

A. There is a D.R. bug on certain accounts.
B. Some accounts are rewarded more than others i.e (One guy has pulled 5 precursors in one day/ One guy has up to 3 legendaries and 2 precursors (and yes we’ve done the same methods of obtaining loot/time spent earning loot.)
C. User Bias (now this is a touchy issue but I believe it is a little more than bias.)
D. Saved up to literally 500 champ bags with only 1-2 rares dropping.

All I’m asking is that this be looked into a little further, I’m not asking for immediate satisfaction, just for some sort of diagnostic or reassurance that maybe will point this issue in the right direction, as clearly time spent does not = reward.

I feel that I am missing some point or not saying everything I experienced but,

I love your game and wish your company the best, thanks for your time.
p.s all zerkers armor 5 lvl 80s