I think it's perfectly logical and reasonable that Smallville got a lot more screentime than LnC. It's still on the air - which means it has more (active) fans, and if you devote time to it, then you'll get more of those Smallville fans buying your DVD. The current incarnation will almost always get the bulk of screentime.
LnC is often dismissed with the greater Superman family. It's not the same as other Superman fandoms. A lot of comic fans hate LnC (a lot hate Smallville, too, but it's got lots of non-comic fans - though I'd expect most will forget about it once it's off the air). LnC is a very non-traditional Superman and a lot of people don't find LnC's Superman tough enough or have a problem with his physical appearance. And, and I hope I don't get too much flack for this, LnC's Superman isn't that great. I love LnC's Lois and LnC's Clark - my favorite Lois and my favorite Clark, ever. But Dean as Superman has no "oomph" to me, inspires no awe, has no majesty, doesn't evoke that feeling I get inside me that some other Supermans do. LnC is about Lois and Clark more than Superman (hence the title) and is my favorite of all the Superman series, but when you're doing something about Superman through the ages, it's more about Superman, particularly Superman-the-icon, than it is about Clark-the-man.
