The answer to this question depends upon the person who answers. For those who are content to allow others to make decisions for them, who are willing to give up personal freedom for basic needs (food, water, shelter), the answer would probably be that their venture was not worth it. People who once had their basic needs met, but then lose them, may also feel the venture was not worth it. As it says in the book, "If he [Jonas] had stayed in the community, he would not be [starving]."
However, people who value freedom and don't like others making decisions for them may be of the opposite opinion. While the basic necessities of life are provided in the Community, there is no individuality, no opportunity for people to make their own decisions, no opportunity to choose their own destinies. Is this a life worth living? As it says in the book, "If he [Jonas] had stayed, he would have starved in other ways. He would have lived a life hungry for feeling, for color, for love."
The answer to this question depends entirely upon the individual's need for personal choice and willingness to take risks. Lowry seems to suggest that choice and freedom are more important than guaranteed survival.