We actually haven't gotten many orders directly from the CSS galleries. While some designers do order our resumes, they aren't our primary target market (many of them will design their own.)
From our standpoint, it helps out with getting some solid back links for SEO purposes in the beginning and also helps from a referral standpoint. We also just like seeing and spreading great design. We're kind of passionate about that. Some designers will send the link to their non-designer friends because they don't feel like doing it pro-bono for their friend and the money their friend can pay just isn't worth it to create something from scratch.
However, if you have a product or service whose direct customer is designers, then you might be able to get some conversions from the CSS galleries. Your's could be this case.