Well I think the biggest reason for this is that you can't get an LTZ with a 5 speed. At least when I was going to by my car you couldn't..
As far as I know, the 5 speed only came on the very base model LS with no power windows and base model radio.
Other than that, not a lot of people who can afford a LTZ sonic would buy one, they would rather buy a lower model cruze.
I work at the biggest car dealership in CNY, and we hardly sell any sonics, maybe 3 a month, as opposed to 3 cruzes a day...
You can get a 5spd ltz. I have one. 2013 tho
I test drove a cruz ls. Boring.
They did have a cruz rs and that was nice..but $26k? No thanks.