You meet lots of different people in the course of life and some of them tend to be very skeptical. The thing is that this quality helps them live their lives with as little disappointment as possible.
Apart from that, there is an idea that being skeptical helps you make rational decisions as well as keep calm when something unexpected occurs in your life. So, skeptical people are surely convinced that being skeptical helps them deal with their problems as well as live their life in general.
Yet, it does not mean that you will make more mistakes or be unable to make some serious decisions when you do not consider yourself to be skeptical. Being reasonable has nothing to do with the fact whether you are skeptical or not. Besides, it should most definitely be your decision in terms of what worldview you have as well as how you want to perceive life. Being skeptical is simply an approach which a person has towards life and events that happen in their life.