I really need the trinket from a certain dungeon. I would be willing to go with a lower rated dps player if they had that key that I need. Sure, I would never accept them into my group as an applicant, but with that key you’ve got yourself a tank.
Why would I take a 1400 rated dps in my group when there’s 10 other dps with higher rating than you? Not that you couldn’t do it, but the 1450 is just a better option. That all changes if you’re a 1400 with the key.