High performing brands spend up to 25% of their budget on measurement. So the answer is less, would you, more of, how much performance do you want? As the top performers invest in their measurement and analytics. As it gives them more intelligence on the areas to improve, so they can lift the quality of their content programs.
However it is worth mentioning, many content analytics tools let you get started for free. Then once you have used it, you can then upgrade to get the right mix of features that you need.
This is part of our Guide to Content Marketing Analytics.