PSUs are much harder to sell on eBay than any other computer component (maybe besides cases). Brand names like Corsair seem to sell a little easier than Antec, Seasonic, OCZ, PC P&C, Rosewill, or NZXT.
Hell I tried selling my Antec TPQ-1200 OC for $125 for several months before I eventually got a buyer.
Only Corsair is brand name? Seasonic is the top brand out there. My NZXT is Seasonic guts + 5 year warranty + 3-day replacement of failed units.