I finally got irked enough to send a seller a message about an item he'd overpriced. Note that this was a "power" seller, not just some amateur selling something he knew nothing about.
Here's the message I sent:
Let's see. The kit is in the current Walthers at $12.
> My local hobby shop discounts 10% so I can buy it for
> $10.80.
>
> And your $14+ buy it now is a bargain? It usually sells
> for much more?
>
> Looks like a scam to me.
And here's the response I got:
AND I SHOULD GIVE A HOOT WHAT YOU THINK - PATHETIC LITTLE
> CREATURES SUCH AS YOU ARE WHY THE WORLD IS IN THE SHAPE IT
> IS IN -- I NEVER ASK YOU TO BID NOR -- DID I ASK FOR
> DRIVEL RHETORIC-- NOW GO HUMP SOMEBODY ELSE LEG LITTLE --
> MUTT!!!!!!!!
>
> BY THE WAY YOU WOULDN'T KNOW A SCAM IF IT HIT YOU.
>
> OH BY THE WAY YOU HAVE BEEN REPORTED TO EBAY FOR YOUR
> UNSOLICITED EMAIL -- YOU MAY WANT TO CHECK THERE POLICIES
> REGARDING SUCH -- NOW BE GONE LACKY.
I think I hit a nerve :-).
BTW, I forwarded his highly literate response to Ebay. I doubt it'll do any good, but what the heck.