If I'm doing homework I expect an office visit. And pizza, or lunch, or something. I expect to be a serious candidate.

I code and troubleshoot for $$$, and unless there is a direct route to interview + hire (or at least lunch) I'm not interested. I understand there are sorting methods needed to do hiring, and I'll play that game if I have to, but if there is no direct, up front expectation that I'm in the running then it's just kind of patronizing without payoff.