"Man is least himself when he talks in his own person. Give him a mask, and he will tell you the truth." -Oscar Wilde
I don't know how to say it any more plainly than this: Creating
personas is important.
The persona is so important because it affects so many other pieces of the project -- discovery, design, QA, and even
search engine optimization. A persona is the answer to the question "who are we doing all this work for?". What you know about him or her will inform your choices about how your site will be found, how it will look and how it will function. Budgeting for personas is always time and money well spent.