Well I was wondering regarding that this post is 6 years old now did you come past the risk of losing money by implementing strategies somehow?
I recently looked into this topic myself and I think that the aforementioned market risk is preventing any Arbitrage bot from becoming successful. Do you agree?

I would say that everything > 20$ is fine. But I want to add that daytrading might get you a lower profit since taxes might apply. In some European countries crypto earnings are subject to taxes if they are cashed less than one year after investing. I can't tell what tax laws apply in your country but it might be worth checking that.

JOINED! good luck 

If you just imagine that the universe is 13.8 billion years old - there must be life somewhere

You should think about seeting up your own VPS. Might be more secure.

Definitely YES... but not right now since we are seeing an all time high. Waiting a couple of days should give you a better rate and puts you into the right position to see the next ATH which will come for sure