Great secondary site or primary site for long-term and short term lead generation.
Top-roofing.com boasts a great name that can be used for any secondary site to a primary site.
If you are a roofing company, you would simply run ads for your area, for your main website and top-roofing.com. You would redirect traffic to your main site, so when people are clicking, they end up on your main site. If there are 5 roofing companies at the top, you will have 2 out of 5 spots at the top if top-roofing shows up in the ad section.