People skip trash mobs because they're both unrewarding and just not fun to fight. If you enjoy wasting time fighting trash then just find three other people who share your interest in fighting things vastly weaker than your group as slowly as possible. Because most people just want to get through the crappy grind dungeons as quickly as possible so they can spend more time doing things they actually enjoy (The nerve of them, right?). Or, leave feedback on the forums asking for less crappy chore dungeons that need to be run over and over again week after week, which completely drains the fun out of them even further. I don't care how cool a dungeon is, it's not very awesome when doing it for the 100th time.

It's a chore. You don't wash your clothes one at a time by hand, I bet. You use a washer machine. Same concept here.