Just chiming in....I'm one of the people who have been clamoring for a LITE-type series because that's where I am. And yes, there are a million other beginner-to-intermediate exercise series...but none of them is Cathe.
Let's say I really like ice cream (which is true) and that my favorite is X brand. There are a TON of ice cream makers and flavors out there, but none of them are going to be as good as X brand. I might even try other brands and think to my self, "This is okay, but if X brand made this, it would be really good." I want Cathe to be my sole provider of exercise ice cream! But I know she's only human and only has so many hours in a day.
I do see real value in the intermediate-level workouts to expand her audience and bring in people to the Cathlete fold who might not otherwise find her, or might just think "Oh, yeah, I'd try Cathe's stuff, but her workouts are always too advanced." If we want her work sustained (and we do!), it does require continually expanding the market share instead of "specializing."
That said, now that LITE's coming out, combined with ICE and LIS, that's probably enough for a while in that category. Step fans will get a new workout soon, too...so it seems like the *next* thing that should be worked on after LITE is a tough, hard-core advanced series.