Snapchat is for people you know closely and chat with all day, but finsta is for your real closest friends.
Are premium Snapchat accounts just porn? It arranges all the categories in alphabetical order, so they are easier to find.
People who are coining it from their premium Snapchat accounts just use other money transfer services like PayPal.
Hopefully, you will never have to search for something that happened to you, but if you ever get into any legal trouble, this is the place to go.