But why else? Well by wrapping the spring you have a chance to customize your bock. Make it your own. Many people use different colored tape, making different patterns on their bocks.
How should you do it?
Start with a really tight base, keep your wrapping really close together. Starting at one end and spiraling up. Go around with at least three layers of tape. I found that doing it in alternating directions worked fine. After the third layer try doing a layer of tape straight up and down the front and back. To kind of give it a clean no tape lined look. After the duct tape, you can try vinyl electrical tape to add some custom flare.