I`ve been keeping an eye on your site for some time as I think it`s a unique way for small businesses to acquire a brand/logo at a reasonable price.
Art`s suggestion of matching domain owners with designers to co-op projects may be something to think about. That may bring a new set of customers to your brand designers. However, many domainers are into buying and selling domain names, not branding and not logos. They may need a brand, logo or design to pull traffic to the domain which can help up the value of the domain name or a brand/logo/design may be required in order for them to monetize or sell the site. All in all, I think that avenue would be interesting to explore.
Here`s something else to think about... It appears you promote your company from a branding angle. From what I see, you`re actually an advertiser and/or promoter. Your site promotes designers and advertises ready-made logos and brands. Consider promoting and operating from this angle.
As an example, look at Zappos.com. CEO, Tony Hsieh, makes it very clear... They don`t sell shoes. Their business is customer service, and I can tell you from experience that Zappo`s is very, very good at what they do, Customer Service. Think about that for a moment and perhaps you can imagine that the business would promote, advertise and operate much differently if they were in the business of selling shoes. However, that`s not their business. They sell customer service.
Don`t think, “IncSpring is a new way to brand your business”, think, “IncSpring provides advertising for logo and brand designers.” You`re in the advertising business and looking at it from that angle would most likely call for you to operate and promote differently.