As I was working on distinguishing banned usernames, I discovered out that after successfully emulating an Android registration in terms of code, I can actually register new accounts.
They need an email confirmation before they're made active first but otherwise they're fully functional. Excellent if you're a trader and need fresh accounts to hold your usernames or act as temps for swaps.
Since in the eyes of Instagram it's a new device each time you launch it, there's no upper limit.
If you're interested, roughly what price would you be willing to pay? I'm not expecting much from this, just curious.