I want to favourite (not: bookmark) an answer, that isn't the top one and isn't that good to deserve to be top one. But, still, it is enough important for me to favorite it. I can't! Why?
Favoring question and upvoting answer is not the solution. Answer in important to me, but may not be same good to others. Plus, my single vote won't bring it to the top.
Favoring question and remembering answer is even worse solution. Answer can be very deeply in the list, or on another page, and it's position will vary from time to time.
Bookmarking answer is not a solution. I don't want to mess with my bookmarks for this single purpose and because I strictly ask about favoring not bookmarking an answer. So I'll be able to access from my profile, not from my bookmarks bar. I'm allowed to have such desire, right?
Once again, this question asks, what are the reasons behind not implementing such obvious feature so far. It does not asks (as linked ones), how to work-around this missing.
And as a beautiful summary:
Questions are merely the sand that produces the pearl.
Since Jeff said, that answers are far more important than questions, then why the hell we can't favorite them? Why we're limited to questions only?
EDIT: Too many people suggests here, that favorites works like bookmarks, and that is, why we don't need to favorite answers, but we can favorite questions. They don't. Not for me and not for others (probably). If any argument said here (like cluttering bookmarks bar with countless number of bookmarks) does not convince you, then let me put that this way: favorites are public, so I can express my point of interest to others; bookmarks are my own, private (and thus sucks!)