It is kinda weird, maybe, maybe not.
Same seller has been listing many items that seem to have been used once (very low puffs) or not at all. He/she has been listing all the same gear over on VU as well. Also has a 100% rating in the VU classifieds. So I don't think anything funny is going on.
Acquiring mass produced Chinese manufactured gear at cost, maybe.
With the high-end gear there is no way he's buying those at cost. Zero chance. Like this listing for example:
New C4 Designs Fuse 21 1.5 DNA 100c Boro mod Need to sell asap
30 puffs on chip
$265 shipped priority by me need to sell asap
I'm fairly certain that mod was a Facebook group purchase. Like here, every high-end mod he/she has sold on VU has had either 28-30 puffs or was brand new. In a different listing for someone else, he/she mentioned being active in the Facebook B/S/T groups.
I have seen someone else who is always listing a ton of vape gear in the F.T.B BST group. His most current listing from 26 June has 49 items listed. Most of it is high-end gear. The guy is out of NYC and seems to have a decent reputation on FB.
So, who knows???