What scam is this?
I do email only and if an inquiry is as generic as "item still for sale?", then it's pretty obvious it's a scam.
Ask me a human, reasonably intelligent question, and I'll respond.
I also don't get the "I don't have time to answer questions" mentality.
That's how you make a sale!
Converse using the method that accommodates safety and the time convenient to both parties- email, and answer questions.
Simple recipe for success.