Because Hope survives best at the Hearth.

“I found that things weren't going well upstairs. Carter was a crumpled heap of…”

“Your powers drain you too much,' [Percy] noted.[Nico] nodded sleepily. 'With gr…”

“Piper: it looks like we have hole. Percy: Yeah we've got a dam hole! (LOL-ing) …”

“I thought she'd make some comment about the bloodthirsty gods chasing us, but w…”