Hmm. "Grand Prize": a $1000 advance (presumably cash), and publication in the anthology (with perhaps more royalties to follow?)
vs. "First Prize": a "publishing package" from S&S's "Archway" self-publishing division worth $5k.
Sounds to me like "First Prize" is the new "Honorable Mention."
(Uh, the last time I checked, real self-publication involved hiring a printer and a bookbinder, and supplying camera-ready copy or a print-optimized PDF. Or in extreme cases, doing what the lead docent at the International Printing Museum did, i.e., banging out his uncle's manuscript on a Linotype, locking up hundreds of type formes, hanging them on a Miehle Vertical, running them off, and shipping large cartons of pages off to a bindery. Archway sounds like a subsidy division, barely a step above a vanity house.)
Which is to say that if and when my own novel is ready to see the light of day, I will physically print it myself (albeit probably on one of the Museum's offset presses) before I go to a subsidy house, even one like Archway, that's owned by a royalty house.