From a DIYer's perspective, I think RA2 and Homeworks are 2 different markets. As a DIYer I wouldn't do a HW install in my house by myself, but I'd do a Ra2 install. And I can probably make the lights go on and off. :-)
How often does it happen that you go into a home to JUST do lighting control? That happen a lot? As a CI you bring a lot to the table. You know, by constant exposure to this stuff, what works and what doesn't. Best practices when setting up this or that. You make the integration more natural to the way people live. You guys think beyond the simple light switch because you configure this stuff all the time. People who aren't CIs don't think about it. They don't have to. Flip a switch... light goes on. Now when you install a lighting control system.... it needs to work logically... like a human would make it work if they didn't have to think about it.