As of now March 10 3pm Alphabay is still featuring a Vendor called "DomesticSeller" on their frontpage, selling 10g +1g MDMA for $66. There are dozen of reports on the boards about this vendor from user being scammed, several users claimed they were doxxed by him on the Alphabayforum and bad reviews are pilling up of other user being scammers - yet Alphabay allow DS to continue selling.
I don't think they give a fuck, unfortunately. They get 4 percent off of each sale he makes so there's no reason for them to ban him if he's bringing them money.