Just read over the Revised Advanced Class Guide Playtest. So, beyond not wanting to just stand there being silly, is there anything stopping a Skald from burning their actions every turn in order to rage cycle, turning any once per rage rage powers (being granted to all martials in the party) into once per round rage powers?
Sure, at lower levels the Skald would be burning a standard action every turn to do it, and mid levels, their move action, but in a party of all martials, properly built, this could get reasonably nasty.
Also, it appears that Skalds can take Totem rage powers as long as they don't take a standard action or rounds of rage to activate. Pouncing martial party anyone?