I think you are being too paranoid. If anything the buyer should be more paranoid because they have the cash. Your insistence on a phone number may make you seem like a stalker.

I have started putting my text number in the contact info section. That seems to work well as most college kids who want to buy from me use text exclusively. I also have their phone number when they text me.

The scammers have picked up on the text angle though. Last couple times from I have gotten a text from an out of state number asking me to email them because they are at work. When I have emailed then I get a response stating the usual scammer stuff. Maybe they do this to get around the hidden CL email.

Scammers are pretty easy to filter out.