Ofcourse they work. The fact that studios know that every fan of the series is gonna be glued to thier seat coming next fall dieing to know how its gonna end is a good incentive for them. Yes it sucks big time for series that get canceled but for those that dont its a boost to the ratings come the fall premiere.
I personally love and hate them. They drive me crazy for those few months but the anticipation and waiting to see what happens makes me want to watch even more.
"Winter is coming." "Bango Skank was here." "The enemy gate is down" "Death is lighter than a feather, duty heavier than a mountain."