I can see this point.
But also, I can see this being the reason why it might be legit... this person might be looking for a rifle, and anticipating it will be hard to line one up right now. I've done some online searches, and there ain't a lot out there at the moment. I'm searching for opportunity, not necessity, so I'm not eager to go over a certain point.
I'm glancing at the AR market right now; the big local store has a few, nothing under 1k. Took me quite awhile to find something online at even the $600 point, and that seems like it was about $150 overpriced compared to earlier price ranges. If I had to have an AR, I'd be in trouble.
If someone is looking at the .308/7.62 market, the PTR-91 seems to be the standard 'good to go' model for value. Higher recommendations than my C308, plenty of cheap magazines available, eats steel cased ammo, and way under the price of a real HK etc.