1
TVs are expensive.
Why spend $400 on a television for your bedroom or your den, when a $100 TV tuner card will give you the benefits of a TV without the clutter? 2
More bang, less buck.
TV tuner cards add functionality; using free PVR software from the Internet, you'll be able to record shows you like for future playback without paying a monthly subscription fee. 3
Back up that tape.
You'll be able to hook up your VCR and save home movies to your hard drive, then back them up to DVD if you've got a burner. No dedicated DVD recorder necessary!