I had this happen to one of my answers on Server Fault. Jeff and/or Joel tweeted it and it made a small splash on Hacker News and both my answer and the question got a lot of votes. I think (well hope) the person who asked the question wouldn't be too unhappy if I said that several of the answers to that question were an example of good answers being the making of an average question.
The up-vote was very nice, but regardless of whether not the question or any of the answers "deserved" that much attention, the fact is that posts of either kind that take the imagination of the web at last are a great chance to publicise the sites and build our userbase. That's more people asking the questions you love to answer or helping you solve that tricky problem that's keeping you awake at nights.
I might well be biased but I think that's worth the rep boost anyone associated with the publicised question might get. And the cap should stop it getting totally out of hand.
