Chip-3Door I can see your point mate but personally I wouldnt let that put me off getting one. Granted there will be the odd occasion where potential employers will see it as something off putting to customers, as you do. It depends on the individual who gets it really as obviously they know that it will happen.
It also depends on the tattoo too IMO, size, design etc. "FUCK OFF" in big letters round your throat is a big no no but others may be seen as acceptable. I suppose jobs wise it will depend on time, place and individual.
It wouldnt put me off getting one though, I just need to find something I like and Im planning on getting a couple on my head. Been looking for ages and cant find owt tho.