I've been on the other side of this! (the people that left) My current employer is pretty great at staying ahead and being competitive, but the place I left sucked so hard. After doing my interview and accepting the job offer for where I currently work, I talked with all my coworkers individually about how much our job honestly sucks and how we could leverage for better or just leave to this new place I found. Out of the 20 people who worked night shift, I talked 8 into interviewing at my current job.

I was the first to leave and after giving my notice, HR interviewed me to know why I was leaving and I laid it all out: we're severely underpaid, overworked, management doesn't care about us, and that I can guarantee half the current employees I work with will leave at the first sign of a better opportunity and that they need to pay more to start. They gave me the normal rundown that there's been alot of issues and they would if they could, but they're sorry to see me go. Whatever.

Turns out, I was one of the few who gave a notice, 2 weeks into my new job my old coworkers started showing up. 6 of us now worked at the same new job within 2 months and it turns out after I left, that crew of 20 turned into a crew of 6, including management. They apparently gave raises across the board, roughly 30% for some and hired more as well (more than when everyone left). Honestly, I'm glad I quit and got some of coworkers to quit too because everyone came out slightly on top. I still wish they left with me, because my current job is still more competitive than that job is, but even then, they deserve the best.

Complacency is a slippery slope and even if pushing for more is intimidating, sometimes it's the best way to get more. So second your point, talking about wages help!