The reason it is happening with CER is because 1 tick can be worth close to 3% and there is reasonable volume trading. Bots trading one tick can turn over a reasonable amount a few times a day. 3%, 3 times a day for 10 days using T+3 can make a lot of money over the year with no outlay. Wish I could get the use of a bot and the brokerage deal that goes with it.