The risk with password managers is that they exist as encrypted files, which can be decrypted with a rememberable passphrase. If someone gets to copy that file (not at all a rare thing) they can throw unlimited resources at it... and it's valuable enough to try that because it has so much of a person's security inside. By comparison, stealing your password from a corporate hack, assuming you don't re-use passwords, compromises only one thing. 

Multiple attempts normally will shut down a network account, but a captured file has no such protection.