Each 1% of Tycoon represents about 15M in trading profits. Keep a note of how much you are making with each run and if you reach 20M without hitting elite then you should probably put in a ticket.
Edit: Seems that the elite trading rank needs 1 billion credits now, not 1.6 billion, so Goemon's figure is closer to the mark than mine. If you hit 8M more profits and don't go up you should put in a ticket.