Sth strange by potential_trades sort and TraderBot

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In arbitrage.observers.traderbot.TraderBot#end_opportunity_finder

def end_opportunity_finder(self):
    if not self.potential_trades:
        return
    self.potential_trades.sort(key=lambda x: x[0])
    # Execute only the best (more profitable)
    self.execute_trade(*self.potential_trades[0][1:])

potential_trades sort by profit and use 0 index not -1
Why choice the most lowest profit params to trade ?

And I think we should find the max_volume to trade before calculate profit not in the opportunity method in TraderBot . I think the profit will more real and make sence.