Will you be excited about that?
What if BitOffer Quantitative Fund can make it?
Don't say it is impossible... You don't know how a quantitative team can do to arbitrage from the bitcoin market which is full of volatility.
What if I say that this is impossible? an individual can do this but he understands if he does offer this to other people, he sure where he'll be landing. There is no guaranteed profit in trading. Arbitrage is a strategy in trading and you can't be sure of it all of the time.
20% fixed return. How good you are in trading and arbitrage? if I'm that good, I'll keep it to myself and won't be asking other people to join the party.