I used to be much more relaxed about this, but if you get burned doing a few rounds of interviews and it was a waste you wise up pretty quickly - teams do not like time wasted.
I've also found that folks who can't / won't talk money - usually not great hires for a bunch of reasons.
We're happy to talk through the different positions, levels, progressions and comp ranges for them all. But you have to have a clue about what type of comp would work for you (early on in initial call or two) or it's just not worth continuing forward.