Something you will notice if you search for the big corporate brands in Google is that Wikipedia pages for those businesses show up in the top 10 results very often. Most businesses do not know that you can create a Wikipedia page for your own business.
However, these business entries do get deleted sometimes, so try to make yours fairly informative and complete, not just profit driven!
If it offers real information or you are a well known business then it is a lot less likely that one of the editors will delete the business page you've created. Deletions still do happen, but if you can get it to stick it is almost guaranteed to rank on page one in Google for your business's name. This will put more and more of YOUR pages on the Top 10 pushing competing agents and commission earning websites down.
Some Wikipedia pages for the BIG businesses include:
AboutUs.org is similar to Wikipedia, except that its entire focus is for businesses to insert their listings. Creating a page for your business on this site will also tend to rank very well for your business name. And your chances of getting deleted are much lower. A walk in the park compared to Wikipedia, but not as strong...