Thanks for your feedback!
Profit should be compared vs a simple hold strategy
That's a valid point, currently Gekko logs the start price and the end price, but doesn't calculate the % increase between the two (which you would have when doing a buy and hold). I will add this!
also it should take fees into account.
It does. You can configure the trading fee in
the profit calculator part of the configuration. The default is 0.6% because the candles I prepared are from Mt. Gox.
And maybe begin with a balanced amount of btc and usd.
On default Gekko starts out with 100 currency (USD) and 1 asset (BTC), but again this is based on the configuration. You can edit this
in the simulation balance.
I will update the docs so this is clear without reading the configuration files.