If Rick did group tours of Iceland, he'd still have to use local guides and the costs would be well, well above his average tour prices (probably even higher than the Scandinavia tours). You can easily spend $500 a day in Iceland if you base yourself entirely in Reykjavik and do morning-to-dusk guided day trips. That's why there are so many self-drive packages out there that include car and lodging throughout the country. Lodging and food are really pricy, although the food is excellent and unique (includes puffin, which I didn't partake of, lamb, lobster, and tons of interesting fusion dishes). Reykjavik Excursions is one outfitter among many that I used (I believe they also operate the Flybus from the airport to Reykjavik).
Iceland is really easy to tour independently, really no need for Rick in Iceland. I think you'd need two weeks to "get a good feel of the country" and that means driving the entire Ring Road and overnighting in very small villages scattered throughout.
I believe you're a photographer (as a hobby at least)? In that case, you'll LOVE Iceland...it's a dream country for photography.