What scam is this?

I have listed one of my cars on craigslist about a month ago. I priced it extremely high because i dont really want to sell it but it gets the wife off my back as she thinks i have too many cars. Anyway I get about 3 texts a week that will say, "is your car still for sale? if so please call me."
If someone can text why do they not call? Its always a different number so Im guessing its some type of scam. I always reply back to the text with this, "if you can text you should surely be able to dial the number and call yourself"
Never another response.
So now I ask, is this some kind of attempt towards a scam?
Thanks Rod