That sounds about right, and sadly seems that type of person has been showing up more lately in the hobby.
Well at least the Angustipennis is a naturalized species, but I know what you mean. I had a hard time originally finding natives anywhere online myself, then thankfully I started to recognize and find some myself locally. Seems they are either a overlooked species as they are available local for many, or not valued as much as a exotic so they don't bother with them.
From my posts and images lately I keep getting PM's with members wanting to buy Carolina ooths. I have been helping them, but I'm nearly out of ootheca besides some for my area now, and pets for myself of course. Maybe I should just keep a breeding stock of them this year, so I can offer captive breed Carolina ooths to anyone that is looking for them on MF later. Sadly though that won't help those tricked on ebay, and even one seller offering the correct ones wouldn't do much difference either.