Most people who move on to new jobs don't allow a counter-offer. They're that disillusioned with the place--I'd never heard a single person even entertain the idea. So, when I put in my own two weeks, I decided to play ball just to see what would happen (I was on my way out anyway). They offered me a promotion into entry-level management and a raise--their first offer was not only 10k less than my new position, but a raise of less than $1,000 a year. Considering my last promotion resulted in a 2.5% raise, this wasn't shocking--the pay here is miserable. They gave me a second offer, still 5k less than my new position. I found out that my offer for a new role was about FIFTEEN THOUSAND DOLLARS MORE than several women, who'd held the role for two to three years on average, were already making. What started out as a curiosity for me turned up a massive pay gap.
That should about sum up how toxic just about every aspect of this company is. Literally pick any red flag that you've seen at your current or previous job, and it's waving high above the Cog.