Ignoring safety concerns with administering and looking after the patient. the cost increase of getting a tattoo would be astronomical.
of couse it has to be done by someone who is qualified for this and if someone is willing to pay for it why not, people pay a lot mopney for dumb stuff since forever. I mean sure if there is no need for it then there is no market for it but I'm really curious if someone actually tried it before in his tatoo shop.