I believe the answer is far more simple than that.
The stabilization technology curve increases exponentially based on the focal length of the lens.
In short, it's harder to stabilize a camera the more you zoom in.
No established reputation here.
Verbage is very similar to the verbage I've seen with Craigslist and Offerup for scams.
The only way I'd buy a used drone from someone is face to face or through a scam resistant site like Ebay.