Sometimes you need to know how well you are doing in searches in various different geographies. For example you might want to rank in your home market but also see how well you are doing in the global/USA .com market also. Each market will rank your site differently due to many factors and your SEO efforts could help with one while harming the other. In addition,

Search Engine Optimization is an activity that calls for a lot of tools. There is so much data, so many variables, and so much change, that if you tried to do everything manually over the long term then you would soon get overwhelmed. Thankfully there are a lot of free and commercial tools out there that can help a lot. What they don't offer though is a way to keep track of all your own vital SEO information in a centralized manner,