The majority of businesses give away thousands of cards every year, most of which end up in the garbage, or used for making quick notes and shopping lists and then being thrown away. Everybody has business in their desk, at the bottom of purses and poked into wallets and forgotten about. Eventually they become so dog-eared and old we can't remember why we have them, or they are so cheap and flimsy they become illegible.
A plastic business cards is a tiny piece of advertising and if you are in sales, you hope that giving one to a prospect will result in a future sale. With a clear plastic business card, your card will stand out above all the rest.