One word...
WOW!
The only reason that I use Quark is because the rest of the industry has yet to remove their heads from their ...
As I see it three major things are working for Adobe InDesign.
IMHO: Quark is a bunch of arrogant people. They over price their product because it's "specialized." Actually it looks more like a 1988 release of Mac Paint than a page layout program. You would think the money being spent would go towards a better GUI. Honestly, Quark goes slow sometimes anyway, the inception of a better GUI wouldn't hurt performance that much. Also, while sure it is specialized, it's still too much for a product that really hasn't changed since it's second release.
Students are now learning InDesign primarily and Quark on a tertiary level. Certain schools (colleges this is) are realizing that maybe, just maybe there is an alternative. Quark should take notice...
Compliant with 10, Quark still isn't, and doesn't look like it ever will be. (correct me if I'm wrong here!)
There is also the fact that everyone is tired of Quark's corporate attitude, and their support mentality of "well, it's your computer, never our software." Call tech support, you'll see what I mean.
Quark has a handle on the market, and they will forever be used, but I think it's high time for a change... (insert western wah waah wah music here)
Listen to mindbend when he recommends this product. I tried it out, and I'm hooked. Quark no longer resides on this press3 members computer.