Camaro SS Base Price is around 30K, just like the RT. It would be the mid-line model if the planned Z28 is ever produced. Just because SS gives SRT horsepower at R/T price does not mean they cannot be compared.
They will compete for many of the same buyers: those who want some mean American muscle and have 30-35K to spend.
I wish the Challenger was the most speed/per dollar, but it does not seem to be. Nonetheless, I'm pretty sure I still like it the best.
An SS vs SRT comparison would also be fun and valid, but from the perspective of someone looking to spend their own money, comparing cars with roughly equal prices makes sense.