There are plenty of business cards out there with fancy fonts on them. A computer company might use a technical font to try to demonstrate the company's strength or a toy company might use a fun font to try to express how playful they are. These fancy fonts can add a touch of style to your business card, as long as you limit their use. Just a word or two in another font is enough to highlight a piece of information on your business card. Setting some important detail, like your company's name, in a font with a different feel than the simpler typeface you used for your contact information can help a prospective client remember you.
It's a question of balance: you do need most of your card to be very easy to read, but you also want the card to be visually appealing. Careful font selection can give you the best of both worlds.
If you do choose to use two fonts, they do need to match. It can be tough to find two different fonts with similar embellishments, like serifs, but doing so can make your card seem like a cohesive whole — and offer a better impression of your business as a result.