I decided to look into just one, rather than throw it down the spam shoot. As far as I can learn, and that's not a lot, it doesn't seem to be a scam, but rather a money making venture for whoever decided to find an empty store or warehouse and send out email invitations. This particular one is named New Art Originals, and they've gone from an online "gallery" to, and I quote, Exciting Physical Space in London.
A little exploration with Google street view show a part of the city that I wouldn't want to be in after dark, plus the address of 65 Hanbury St shows what I assume is the former occupant, a gallery.
Strychnin Gallery. True. I bet that gallery had a big following.
So....They rent space, which they call slots. Hmmpf. 1000 square feet per slot. Which could be 10 feet of space if the gallery has a 10 foot high ceiling. If it has a 20 foot ceiling, your slot is 5 feet wide. Etc.
So....You can rent one space, er, slot, for one or three days. A one day slot including "website registration"
(why?) is $308. US. A three day slot is $772 US.
There's a Special Introductary Offer, but you get the idea.
There is no talk of jurying, naturally. Or insurance, and of course the shipping is your problem. I shudder to think. All in all a can of worms. But endeavors like this stay in business because some artists need that line on their resume.Has exhibited in London, or Paris, or Florence.
You can rent space in New York at some pretty good locations, but you rent by the foot.Vanity galleries are big business. Art is big business. Except for the artist. And ain't that a shame.