This is a trust question.
YOU: “Can I ask you sir, do you have a website?”
SELLER: “No.”
YOU: “Why don’t you have a website?”
SELLER: “Why would I need a website?”
YOU: “Good question, sir. Why would I need a website?”
SELLER: “So that I can check you out.”
YOU: “Well sir, you’ve just told me you don’t have a website, so how can I check you out?”
SELLER: “Well, I’m being honest.”
YOU: “Do you think I’m being dishonest? Because if you do, then let’s stop now because we could never work together, wouldn't. you agree?.”
SELLER:" Agreed."