These services are mostly used by music companies, local musicians, amateur singers, and college bands, students for projects and college presentations, and music enterprises. Though some of the large reputed music companies use their own facilities and technology for duplication, most do not wish to invest separately in this infrastructure. They would hire a service provider and ensure to get their work done within the given time.
There is no limit for duplication. You can order for 50 or more than 500 CDs. While choosing a duplication service, ensure that the price quoted is according to the quality of the products delivered. If you are offering a bulk project, you can strike a good bargain.