The more components you keep adding to your WordPress blog, the more archives you have, the longer it takes for your pages to load in your visitor's browsers and the more resources your blog uses which increases your hosting cost. If your pages load too slowly visitors will just click off and your traffic and ad sales will suffer. If you are really successful your host could disable your blog because you are using too much resources. This is where a plugin like WP Super Cache WordPress Plugin enters the picture.
Please visit here to read the full review of WP Super Cache WordPress Plugin.