It does'nt necessarily warrant account blocking. Repeated attempts might. You might PM the man and inform him.
If you see repeated attempts, PM to Administrator.
Perhaps cite this to the poster:
"How do I put up my ad?
You don't. If you want to become a sponsor here, there is a link at the top of the column of sponsors in yellow that will get you to an e-mail address where you can discuss sponsorship with the forum owners."