I would think just consider it and let it stay. Couple of reasons:

• As you said, the question itself might be legitimate and might even be interesting. Although there is no effort in the original post, but the effort in the replies could be helpful to others.
• I would leave the decision to the person who post the reply to determine whether it worths their effort to reply. If we delete that original post, we take away the opportunity for people to make their own decision, and some of them might have really good answers.
• Even though there might be no effort, but the thought itself could be quite interesting. Some people might not even know how to spend their effort, and where to start. A while ago, we had a thread about whether to teach people fishing or giving them fish. Maybe we can teach them how to fish in those "no effoort" cases?

In general, I think it is better to keep things more open.