I respectfully disagree.
To only allow one view of things is to invite cognitive dissonance and confirmation bias, neither of which is going to make you any money.
Even if you read the opposing opinion only once in a while, it's important to understand the argument on the other side. At worst, you've cemented the reason WHY you disbelieve the other side, and at best, you'll find new information that might make you bail from a sinking ship. Either way, it's in your best interest to read both sides (or all of them, if more than one)