Quick sales are just small accounts that we get in our phishers. We dont have the time to devote several days and only get ~10k out of it, so we label it a quick sale. There is no bidding, someone just buys it at the listed price.

This is compared to a regular sale, say 2 million gold.
Someone offers 150k LG
Someone else offers 160k
Etc, it takes awhile.