Are all craiglist used ads scam?


Searching for used Krell 402e in Europe i found several on Craiglist for about half the normal price on audiogon and german audio-markt. In the past I have always found used obejcts on the craiglist normally much lower than expected.
Is this all scams??
128x128ulf
If you stay local and deal personally with the buyer, check
the audio equipment if it's in a working condition..you will
avoid scams.

Oh, and make sure they have the original invoice.