She probably had a buy two national security secrets get one free special and last night was the freebie. It would have been more appropriate for Hillary to send it out by e-mail, but well.... Anyways, this was the best way to communicate the special to her numerous customers.
Personally, I do think she sold classified material via putting it on her unsecure server after payment was guaranteed to some cutout.
And NOW she says the Russians can crack any server. But not her unsecured server.