It's no surprise that a lot of people would want to get tattoos of their zodiac sign. If people are serious enough about how their birth month affects their personality that it influences their relationships, they're serious enough to get it etched on their skin.
But a tattoo's meaning should be personal to you.
And if you appreciate the month of your birth, but have no interest in worrying about whether mercury is in retrograde or whatever else is going on there, it may not be the best tattoo option.