It's a blast to fish through 6" of glass clear ice. Especially when you see the fish shooting up under the ice just before you land them - like when you get the belly flash at the boat.
We also have done this within sight of open water at Granby a few times. And the fishing was excellent.
Antero is a rare exception. When the ice is the way it was this past winter, the fishing never really got bad, and the dissolved oxygen was actually highest on record. Also, there was little to no snow on the ice. Unlike in '08 when they had feet upon feet of snow blocking out the sunlight. That's what really caused the dissolved oxygen crash and subsequent winterkill.
Oh, all in all, it's because we want to go catch all the fish first - you know how that is!