Hi Homey Smurf,
I've been wondering the same thing.
Officially, they're on Boomerang right now. Luckily, I actually get Boomerang (I don't think its on every cable system yet), but the odd hours are annoying - although they have nice promos featuring PVC Smurfs...
I really don't think they take showing the Smurfs seriously - and that must be a managerial / executive decision - because you can't tell me that the 5 hour blocks of Josie and the Pussycats - repeated all day long - on Boomerang are more popular.
However, I should point out that The Smurfs are on every few days on Boomerang - I just haven't really noticed a pattern yet. The program guide Boomerang provides to my satellite provider is often wrong, which doesn't help either.
We need a 24 hour Smurfs channel!
Seriously, email cartoonnetwork.com with your complaints - thats the only way I think they'll listen.