Information Asymmetry: Come on, give me a hint!

Attempting to find (decent) work in China has been an exercise in information asymmetry. This has been true from the beginning but it is only recently that I have fit the term to it.

Take for example the phone call I just made:
The call was a follow-up after over a week of no response. I had achieved first contact with the lister but their response answered none of my questions and after emailing them again and waiting I did not receive a second email. So I call, reach some sort of office, am redirected to Lily's mobile. She picks up, seems to have no idea who I am. No shock. These recruiters are surprisingly poorly organized. I often feel that I could do better myself just with Google Translate and a spreadsheet! But that's beside the point. I explain to her that we'd emailed some and I was calling because she didn't email back. She asks what position I'm calling for. Hah! Here's where the information asymmetry comes in.

I wish I had the posting copied so I could show you, but all that I have now are my notes. Allow me to summarize them for you:
Position: ?
Location: ?
Hours: ?
Start date: ?
Salary: 'well paid hour rate'
Kind of hard for me to tell her the position in which I am interested when I myself know so little, huh? This--THIS is with what I have been dealing. These people post listings for jobs with hardly any information. Having hints like 'kids', 'full time', any location, is a miracle! You want to know the salary or hours? Keep dreaming!

What's the point of telling possible candidates nothing? Maybe it's a bad job and they figure that way they'll still get candidates? What, you think I'd say yes in person to a job I'd pass by online? As if! I've become much more comfortable telling people, to their faces, that their job sucks and I don't want it. I'm more polite than that, but not much less honest. The many interviews I've had are starting to pay off. I can recognize BS much faster and, frankly, am done putting up with it. I not the naiive new arrival I was even a month ago, and they're not pulling my strings.