The funny part, as TC mentions, is that PayPal pulled a similar guerrilla marketing stunt in its early days by paying people to wear PayPal t-shirts at an eBay conference. Could we say... revenge is a dish best served cold?
That's very true, but "taste of your own medicine" and frozen/cold didn't have a funny punch line. However, it could be considered revenge by proxy -- WePay assisting with consumers' revenge against PayPal for freezing accounts.
Yes. If you look at my recent comment history, you'll see that, by far, the most effective strategy I've found for getting comments with lots of upvotes is to find a factual error in somebody else's comment and correct it in a clear and unambiguous fashion; and within that constraint, the shorter the better. You'll see that I got a comment consisting entirely of "[citation needed]" voted up to 7.
Long comments have essentially no chance of being voted up significantly. Other things that have very little chance: speculations about the implications of something, wild and surprising analogies, speculation on others' motives, advocacy of norms. This is really unfortunate, because those are the comments I most value reading. I really get no value, beyond a little humor, from reading that gorillas aren't monkeys, since I already know that.
Depends on who you are. If you look at my comment history, you'll find several very long comments with many, many upvotes. On the other hand, when I tried to do the "quick one line correction" thing in this thread, it didn't turn out too well! (though at least it was a nice setup for hugh3)
[Edit: Erm its a reference to the librarian of unseen university from Terry Prattchet, an Urang-utan which attack people who mistake him for a monkey.]