It didn't cost me anything. i wanted to see how far i could get with botting like 8 hours a day. or less and possible sell the account. bt i tihnk they are looking at the f2p account more than anything. so my guess would be to start out normal get their eyes off of you than go bot.
i MADE A FREE TO PLAY ACCOUNT AND IT GOT TO 25 MINING AND LIKE 25 ATTACK WITH 4K FEATHER. I TRIED TO DO SOMETHING WITH AUTH SECURITY THAN I WENT BACK AND IT SAID YOU CANT DO THIS YOUR ACCOUNT IS BANNED. I WAS LIKE WOW THAT WAS FAST DIDNT MAKE A ACCOUNT MORE THAN 24 HOURS AGO. AND BOTTED LESS THAN 8HOURS
http://i.imgur.com/hDLbh8t.png