I think Leaker is a good name and the .org extension could work well with it. In this case the .org extension makes me expect Leaker.org to be something pretty substantial and credible. The fact that Leaker.com is already developed might be a problem for some new brands looking to establish a unique identity. If you find the right end user I think you could get at least low to mid $x,xxx. As is the case with most brandables, you have to wait for an end user who has both a vision and a budget to afford the name which could take some time. You could move it much faster for $xxx if you want faster cash.
IMHO
Best of luck to you