I do readings for free elsewhere online where there is more real time interaction. I've taken to using guilt of sorts to get feedback. I tell folks, "Hey it's free. If I read you, feedback is required. Otherwise, if you're not answering, I'll stop and be done with it."
Usually I get feedback straight away.
I also do paid readings. For paid readings (they don't set the price, I do), I'm not so concerned about feedback. It's nice when it happens, though. And paid-for readings means I don't care about the type of question (within reason) or how often it's asked.