I wonder how many opportunities we lose by throwing away ideas or deeds that we consider unpromising. Sometimes these considerations are based on our complexes, sometimes on our experience, and I cannot say which reason is worse. In any case, while complexes are something that is a bit out of control of an average man, experience is more or less a cognitive substance. A man with huge experience is somewhat similar to an expert system; they maintain a knowledgebase of various statements along with a set of possible ways of their resolution. As a matter of fact, that feature of experience makes life simpler, as it allows to automate many aspects of life; instead of thinking over yet another use case, a man "contacts" his experience database and gets the known pattern for that use case.

What is bad, is that these specifics of our mind prevent us from doing irrational things. It is hard to run something unusual and exotic, as our experience raises both its hands up and shouts "No, buddy, this activity never used to be successful in the past, so what the hell are you expecting from it now? Stop and do something well-tried". As a trivial example, we will never go shopping on Sunday, as our experience tells us that the stores are all closed (and may miss some attractive Sunday offer). This doesn't look reasonable to me.

Our world does not encourage rational way of living; luck and randomness have a great effect on our life. People living in a rational way are doomed to flow together with the common stream, as the factor of randomness is rarely present in a rational life (of course, there are exceptions). As minds of different people are more or less similar to each other (of course, there are exceptions), one will not be able to outrun the crowd acting in the same way as the crowd. By acting irrationally, one brings some randomness and luck into his life (by exploiting the chances that are ignored by the others, rationally-acting people), increasing the probability of catching the faster train.