I'm active in the CTF crowd, and I think the general feeling is that you only want to burn your lower tier exploits at pwn2own. Usually these will be the exploits for things that are harder to sell to an exploit broker. You probably won't see many top tier vulnerabilities at pwn2own.

Zerodium is definitely a bit too well known to have actual market pricing for vulnerabilities, but their tier graphic is pretty accurate (https://zerodium.com/program.html). Notice how most of the things hacked at pwn2own are at the bottom of this graphic.

Selling to a exploit broker is pretty much always more profitable for higher tier exploits, and usually if you're in this industry and want to make bank you'll just work for a company like dfsec where you get bonuses for finding these kinds of exploits anyway.