They're always good to back up experience that you may already have and help get your foot in the door in companies where you would like to work if you have no experience.
Not sure what country you are in. Companies where I live (UK), Some prefer qualifications, some prefer experience.
I have a lot of experience but no paperwork and I get on quite well, but if I had formal accreditations I would do better. Often I find people who have no experience and just qualifications come off as a little green to me. Its a sweeping generalisation I know, but its just my experience of the specific individuals I have worked with.