I think this is the rule with skyauction RSG auctions. You really have to wait until you see the resort you want before you bid, not the other way around.
I had a weird thing happen with me - I bid on an RSG after selecting the resort I wanted, which happened to be Silver Lake Resort. I then bid and won, this was on December 23rd at about 4pm. I got confirmation that Silver Lake was available and that I would get a voucher in 24 hours. Next day was Christmas Eve, and as it turns out, their employees were off Christmas Eve, Christmas Day and that entire weekend, so somehow my ressies at Silver Lake dropped off the system and they never could fulfill them. I demanded I get compensated for that, since I DID reserve the resort before bidding, as they say to do on their website, so they were committed to finding something comprehable for me. They gave me a Sheraton Vistana 2 bedroom at a RSG price - I got lucky, but wow, what a hassle. I must have called them about 20 times. All is well now, though, and I'd bid again - I'd just stay away from the RSG auctions unless I knew FOR SURE which resort I wanted and I wouldn't bid over a long Holiday weekend.
Hopefully the inventory will start looking a little better for your trip.