The Sedo auction for 8888828.com was paid and hit the Sedo sales wire, the name sold for $5,103, yes a 7N.com. The seller is local to me actually about 30 minutes away in King of Prussia, DomainDakini.com purchased the domain name back in 2014, it looks like from a Chinese registrant who hand regged the domain back in 2013.
The domain was dropped twice previously. That is the tricky thing with these names, people tend to get bored with no action and drop a domain name, there certainly was little action in 7N.com back when it was first registered, but for $8 if you believe in the pattern you might have to keep renewing the domain.
The .net is registered actually last month it got registered. The .cn/.wang/.top are registered.
Here is the link to the auction listing, https://sedo.com/auction/auction_history.php?language=us&auction_id=192740&partnerid=17417&language=us