Fresh accounts are almost always banned after 1-2 days.
Still:
Make new account do knight sword to 29 smith, do 1 lvl by hand to 30.
Enter blast furnace, bot 48 hours non stop, sell gainz, account will be banned around this time.
profit: 24-48 hour of runtime @ 350k/h = 8.4 mill - 17 mill gainz.
Quick calculation ^^
Older accounts last longer, my main been doing this pretty long time now. getting 70k/h exp at gold bars atm. Need to hit 85 smith for rune bars xD