I here ya, Joe. I now see them together everywhere.
Bulleit Bourbon was just another Bourbon when it came out, but the Rye really filled a need. Ritt availability is spotty, Baby Saz is rare, and Turkey ruined their Rye. (And Beam's Ryes are about as good as their Bourbon.) When Bulleit Rye comes out, bars had something from a major producer that they could stock and keep around, and retailers needed the price point. I'm guessing that got more placements for the Bourbon.
And Wisconsin is a very frugal state. In fact, I've seen both Bulleits on sale for $19.99 from time to time.