I think it’s because it’s not being aired on popular channels. Even in Canada it’s only on Fuse Superchannel (a pay channel, and not in a cheap package).
I loved the first season and I’m still enjoying it, though the first season was better. Brendan Gleeson is making the show for me. He’s always been an excellent actor. Even when the lines aren’t exceptional, his delivery makes them stand out. But the writing and acting is so good in general. Harry Treadaway, who I’ve only seen in British shows before, is another great actor (as is his twin brother Luke) but everyone is good in this. Great characterization too (of course that’s to be expected with Stephen King, something he’s always paid attention to), you really get invested in the characters.
The experiment reminds me of Firestarter. You just know it’s going to go awry at some point. Now that Bill has confirmed Brady is active in there, it should get interesting. A confrontation is likely on the way.