User blog comment:AnotherRho/Shadow Broker and Cerberus in Mass Effect/@comment-2256917-20100924044041

Maybe one could say that the Shadow Broker has so much more info on Cerberus (in the Shadow Broker DLC) because of the intel that Shepard gave him (or, assuming Shepard gave nothing, that the SB got it from the Alliance, as his agent in ME suggested/threatened). Certainly the Broker doesn't "remember" this favor when it comes to giving Shepard's body to the Collectors.

Then again, from his dossier on Tali one may learn that the Broker gives no heed to reciprocal justice.