Why are people leaving after one or two tries, especially in a fight with Echo, only to queue back as soon as the group is disbanded ?

Unless it's a complete disaster I don't see the point, the more you try the more the members of your party get used to the fight (and additionally your stats are increased with echo).
When you leave you pretty much try your luck hoping to get into an overgeared party, but most of the time you'll get back to square one.

What's worse is that I see this the most with dps. I thought the wait time were atrocious ?
Even though I rarely wait more than five minutes as tank I never give up on a group, shouldn't the 30 minutes wait motivate people to try harder ?

It's a bit disheartening to go through like five different groups to beat the Chrysalis because people leave after the first wipe, or running Titan hard for hours because people leave with 30% echo only to end up 5 min later with them in another group, but without echo.

Sorry for the rant, but I really hope players won't be like that with the new fights when the expansion comes around.