Trying to figure out what this gives me that Selenium doesn't? If I already have a large code base using Selenium why should I switch?
The analogy extends further: We were invited to write an article about Helium in the December issue of Professional Tester (professionaltester.com) in which we compared automating Gmail with Helium vs pure Selenium. The code with Helium was 66% shorter, but ran on average 26% slower than an (optimized) Selenium script. You can find a thorough analysis covering the differences between Helium and Selenium here: http://heliumhq.com/AutomatingGmailWithHelium.pdf
You're going to have some big obstacles to overcome trying to get people to pay for this versus using Selenium.