Or, a huge percentage of the population on TLP all had quit when the game started getting dumbed down, around post-PoP, and will probably will do it again. Some people don't like handouts and being spoon-fed.
Running naked across Karanas isn't challenging, it's boring. Pick up groups are indicative of the low level of challenge that the early game presents. There's nothing there that offers a challenge or any sort of tactics past zerging. It's why the "DPS brah" groups rule TLP.