You're going to crap on any example I give you of players that took millions dollars less than they could have gotten on the open market to get themselves to a place they wanted to be (or stay there).
You know it. I know it.
Players do in fact do that. You know it. I know it.
So what good would providing examples do?
Here is an article with some examples. https://www.businessinsider.com/14-athletes-who-volunteered-pay-cuts-2013-7
Here is one that talks about how stupid it is for players to do this:
https://www.theringer.com/2017/7/7/...dirk-nowitzki-salary-taking-less-eaba72bef463
Yes, I know. All these examples are crap. And none of them are specifically about player opt outs, and you win. Predictive conclusory statement repeated with even more force!