This has been highlighted many times - vampirism shouldn't bleach out tattoos... in fact black ink on pale white skin should stand out even more. I'd certainly want to buy and use tattoos a lot more if they weren't bleached out by vampirism.
It shouldn't bleach out fur or scales, either. A dead orange cat is still orange, and a dead iguana is still green. I cannot imagine what they were thinking.
I was really bummed that the warrior-poet face markings released during the festival won't show very well on my vamp, I got them because I wanted to create a witchy look for my necromancer to go with her 'Witch' title, but she happens to be a vampire, and the colours barely show. Also, I would love a 'sparkle' option for vamps, just saying...