I really don't know much about these speakers and I'm reasonably sure that this is an old thread (and everyone has already moved on), but based on what I've read about them, I think you may be selling them slightly short.
Supposedly, they're equipped with some sort of dome tweeter, not a cone type, so that element, at least, should be fine.
I probably wouldn't pay $100 for them, mainly because there are too many other great deals in used speakers out there, but for about half that, give or take, I'd seriously consider them.
By the way, if the guy who's selling them can't demo them, (a) I wouldn't even THINK about paying $100 for them, (b) I'd use that as a bargaining point ("Well, if I can't hear them before I buy them, I'm not going to be willing to pay even NEAR what you're asking!") and (c) depending on the condition of the cabinets, grills, surrounds, cones and dust caps, you might want to just walk away. Like I said, there are just TONS of great used speaker deals out there; if you're patient and look hard enough, you'll find them!