Dating is like investing in the stock market. We want to get the best possible return on our investment, so we want to be informed and make the right decisions.
We can do some insider trading, by getting info from previous partners and we can do our due diligence and research the product, so that you can make the most educated decisions possible, but the bottom line is, every time you invest your emotional currency in a relationship, there is an element of chance and it is always going to be a gamble. What most people should be doing is learning how to minimize risk.