Often people chase their dream and end up disappointed because they may never reach it or pay very high price for their dream. Chasing a dream people often forget to live and when/if they achieve the Dream, it may be too late for them to live.
People are judged for the lack of ambition/drive, however if they found balance in life and living their dream who are we to say they should dream big?
It is always good to have big dreams, but should always have smaller achievable goals towards your dream. Achieving each goal makes you happier and move one step closer to your final dream. This way weather you reach your dream or not, you are likely to live happier life.