Buying used or sight unseen speakers a bad idea?

Just be aware that if speakers are not packed properly, they can be damaged in shipping. I bought a speaker that was not packed tight enough, got shook around by FedEx, and ended up getting some damage on it.

Seems like a lot of classifieds have appeared recently here on Agon with feedback scores of 0. Perhaps it's just due to the un-economy, and people are needing to raise some money.

Yep, there is a set of large speakers for sale on Agon right now that I emailed the seller about. This seller has a zero feedback score. It's been two days and no reply to my email. I'm really interested in that model speaker, but this doesn't look good.

How does one escalate an issue? I have one right now on a purchase.