If you're advertising that you're going to permanently mark your almost certainly transient brand on desperate people for the promise of just an interview, I think it's fair to wonder what you'd prefer to keep hidden. In your case it's all puppies and rainbows, but presumably your public face is also quite a bit milder than, "Sure get the tattoo and maybe I'll see if you can make it to the next round of interviews, hope you're ready to work 7-day weeks if you make it!"