You would have a better chance waiting for a fundamental change in a currency. Something like a rate hike/cut/QE ect.. BOJ is probably still the best option since it's not a set time of the announcement the algos can't grab it as quickly and you have a shot at getting a better price. Obviously EUR is supposed to be the next to do QE but the way they have been slowly leaking the details it could make the trade a lot harder to get any edge into.
Your strategy would only work it sounds like if you got instant edge which is tough to do without looking for small wins.
You would probably be better off splitting your stake into 2 separate accounts. In one account buy a biotechnology stock in the other account short the same stock. You will take tons of losses and probably never get one to work but just maybe you will get a stock that goes from $3 to $500. Even then your losses probably won't be made back. Moral of the story, random trading is deadly.
Your strategy would only work it sounds like if you got instant edge which is tough to do without looking for small wins.
You would probably be better off splitting your stake into 2 separate accounts. In one account buy a biotechnology stock in the other account short the same stock. You will take tons of losses and probably never get one to work but just maybe you will get a stock that goes from $3 to $500. Even then your losses probably won't be made back. Moral of the story, random trading is deadly.