Jody, if you fill in your profile and utilize your signature correctly you will still find your information retrieved by Google via VAF for relative searches, although admittedly not as much as if you had selected your exact company name for your username.
That's why we include that same paragraph in the page that prompts you to select a username. We do understand not all members are going to have a business name when they register, but the advice is aimed at those who do.
Make good use of your profile and link to your business site in your signature, with your company name included, and it will certainly help in the effort to get your business name out there.
Good luck!