Once a celebrity or famous person goes to prison, the time that they are in prison is when others can be capitalizing on their business ventures since they do not have direct competition. After leaving prison, the celebrity will need to work hard to revive their career.
In the case of Martha Stewart, she remained in prison for a few months which is good since it was not a long prison sentence. It seems the longer you are in prison, then the longer it would take you to revive your career.
Martha Stewart was not as popular after prison, but she did somewhat revive her career by putting her products in K-Mart and Sears as well as starting two more television shows.