I dont recall ever seing a custom house going for gold and yes, there will be more then just deco and houses, they always have gear, custom pets, rare items and maybe some mistery boxes.
On a side note, for the house drop, i do wish no gates would be made for everyone to jump in and raid these houses. I spend a fair ammount of time searching for these, kinda makes it pointless for me if the filled or big account houses are made available to all! Its like anything, you gotta put in the work for the big reward. Back on OSI idoc houses werent publicised, you had to find them but when you did, oh the joy!
I also believe it would cut down drasticaly on the hate and headaches they bring you guys, remember the last house drop event?