Well...On top of daily traffic, is important to you to have and grow a readership base? At least you know that X# of people want to see what you have to post. That's on top of Serp traffic, links, and book marks. It all blends in together to make a nice traffic stew Yes it is important, it's more places for you to publicize your blog. There are a lot of services that promote feeds. A ton of them actually.