We sure didn't. I think one guy got hired by Apple because he came out with an innovative app switcher, and I know a few others who got internships there, but largely speaking, Apple took over a lot of features we put into play.
P.S. There's another reason why jailbreaks are few and far in between. There is close to no trust between the people who create the jailbreaks...I had several good exploits that became public without my permission.
I remember it being a practice at one time in various IRC and other online communities to share hashes of the exploit payloads between teams so that they knew whether or not there was one or more than one, and whether or not they were going to collaborate.
P.S. There's another reason why jailbreaks are few and far in between. There is close to no trust between the people who create the jailbreaks...I had several good exploits that became public without my permission.