Someone locally is selling a hobby item that I recently parted with myself. They are selling it for $100 less than I sold mine for. Their item is in much better condition with more accessories than mine was.
Aside from the fact that I know for certain (absolutely for certain) that they could get more than they are asking for their item, they have mislabelled the type of item.
Let's call it a Widget from Widger Co. Widger Co makes Widgets that are given special names like Annie, Bob, Charlie. They also have a Widget called Widger, which was their original Widget.
I just sold my Annie Widget last week. I am looking for a new, smaller widget, so often look on places like Craigslist for a smaller Widget.
Someone posted a Widget this week. It is an Annie Widget. This Annie Widget is in very beautiful condition and it is obvious from the pictures that it has been cared for. However, because the Widget bears a label that reads "Widger Co Widget" (as all older Widgets by Widger Co did), the seller has erroniously assumed that this is a Widger Widget. It's not. It's an Annie Widget. There are several key differences between a Widger and an Annie Widget. A quick google search of "Widget Co" (not the real name, btw) shows all Widger Co's past and present models of Widgets.
Due to the condition of the Annie Widget, I know that the seller could get at least another $200 or more if they asked. Widget buyers like to haggle, so it's likely that they'd get even less than they are asking for it, which is a steal.
Do you think it would be weird, strange, or generally out of line to send a quick email to the seller through the website letting them know that they are selling an Annie and not a Widger? I am a pretty experienced Widget user, and the way the post is phrased makes me believe the Widget seller may not be an experienced Widgeteer.
(edited to add):
If I were to send them a note, I would send something along the lines of "Hi, I just spotted this post for your beautiful Widget while I was looking for a Bob or a Charlie Widget. I just wanted to let you know that this is actually an Annie Widget. Annies are A-type Widgets with X-wings, and Widger Widgets have Y-wings. It's a beautiful Annies, too. I just sold my Annie for about $100 more than you're asking, and it wasn't in nearly as nice as what you are selling. I know this is unsolicited, but you can probably get quite a bit more than you're asking. But mainly, I just wanted you to know that you have an Annie, not a Widger. The company name is also Widger Co, which is why your label says Widger Widget. (and I would insert the link to Widger Co's online catalog)"