There are more, statistically sounder methods that could be used to search the space of possible strategies, a la bootstrapping. These could be used to make more meaningful statements about the strategy, if the assumption is that previous statistics predict future statistics, which of course might also be false (black swans, etc.)

Given the vast amount of parameters that constitute a strategy, naive optimizing of the outcome of the strategy in the past is bound to produce overfitting in the majority of cases...