Kind of surprising it took so long to figure out and optimize. As an outsider it always kind of smelled to me like their marketplace was flawed, even back several years ago when I first saw it.
Auction takes too long / is too heavy. The whole point of a convenience app is that it is supposed to be "just take care of this for me", not "let's spend time figuring out the bid/accept process".
You could see the listings sitting around in the marketplace for extended periods of time if you browse a bit. And I never used it because I didn't like that I had to guess how much the job was worth. It was clear that something in the model was broken