Wow, one trip SEA-SIN RT in J/C and you can pretty much get Gold, I guess if you routed via HNL it would be over 50k EQMs. That's a tempting offer, competing pretty well against the current BA promo (which is 50k RDM bonus for every premium R/T).
As much as the non-premium side of this deal is not very good, the 3x for premium classes is rock solid (and I suspect that is where the airlines REALLY need some help right now).