The problem is you've already missed all the 7 day advance purchase fares.
There's an EWR-SFO S fare (SG73XSNN) that prices out $239 roundtrip, but it has a 7 day purchase requirement and a 3 day min stay, Dep/Ret Tue/Wed/Thurs/Sat. Two of those, and you've got your 10k EQMs @ $460.
(There are similar S fares to LAX/SNA/SAN/SEA.)