People get tattoos for any number of reasons, such as in memory of a loved one, military or gang affiliation, or artistic expression, etc. For a small-business owner, it is a way of making a living.
I am not writing this to be judgmental (really). However, as a Christian I would suggest reading Leviticus 19:28 in the Old Testament.
Editor's Note: In the New International Version, this scripture reads, "Do not cut your bodies for the dead or put tattoo marks on yourselves. I am the Lord."