In some respects they ARE taking my money ... the company now has less money to distribute based upon merit.
Also, I would immediately become a 9-5 employee and enjoy my weekends like my now equally paid peers.
I mean if the market rate for the job you were doing is $70k, and all of a sudden fresh college grads are getting paid that at your company, it doesn't mean that you'll now get $100k elsewhere if you leave. If that is the case, you should have already left.
Now if you were already being underpaid and you were staying at the company for some other reason I could see bailing when others got a pay bump regardless of their contribution.
Don't force your value system on others.
I personally am happiest when I'm working 70-80 hours a week and appreciate being compensated for my hard work. Just because that doesn't describe you doesn't mean I should be forced to attain an artificial "balance."
Secondly, Ensorceled specifically said (s)he would start "enjoying the weekends", which implies the long hours were, unlike for you, not being particularly enjoyable.
Don't be so certain that the company will be sad to see you leave. The people who replace you might be even better than you.
There were a number of people making less than that at Gravity Payments; so it seems likely that there are other qualified people in the area who will appreciate the salary that you are now grumpy over.
In fact, apparently 1000s are applying to Gravity Payments hoping to take any grumpy person's job.
So if you are grumpy and 9-5ing it (as you said); why should Gravity Payments keep you?
How would your stated attitude help you work with people who did get a raise?
This kind of attitude is toxic.