If you want to lose money, this is a good way to do it. You're better off buying what you believe in and holding it. It's easy to fit a perfect model to historical data, but it rarely works going forward, unless you have insider information.
Can you expand on why you don't think algo trading with predictive algorithms is a viable strategy? GDAX has 0% fees on limit orders. Say you set a limit sell at +1% and a stop loss at -1%. You could trigger a buy whenever you predict that it's >80% likely to hit +1% before -1%. Plug in everything you can get (trades, order book, etc) from GDAX's WebSocket API into an RNN, and I'd guess you can be right more than you…
Even basic ML/AI strategies can be easily profitable with the current volatility. It drastically reduces the risk of the HOLD strategy, and while not necessarily the top profits, can be much safer.
I've been running various algorithms for the past 4 months with varying success (whole system homemade in Python), all profitable.
I'd also note that as mentioned elsewhere in the thread, what algorithm is very important. This market is like few others, and thus I have found lends itself to very different strategies.