Well, you still need to take its debt into account as well, which I'm assuming Imeem has quite a bit if it sold for so low with 16 million users. A company with $10M in debt, for instance, that's purchased for $2, is really a $12M acquisition.
You're right that the value of a trade is minuscule. But, a trade's value only amounts to only a handful of cents.
The top high-frequency traders though multiply that minuscule effect by millions (amounting to a much higher-value add as a whole to society), which IMHO justifies their high earnings.
I can't tell you how many times I've tried logging into HN using the signup form (which, of course, doesn't ask for your password confirmation). The password confirmation, I think, has become a necessary input field to let users instantly recognize and know that they're signing up for an account. Qwerty keyboards, for example, aren't the most efficient way to type, but the layout has become so ingrained into our brains that we can't imagine any other way to type.
Well, I think those actually researching YC on Wikipedia would find a comprehensive list relevant. The alumni lists on Wikipedia, for example, aren't very interesting to a large population, but it does serve those researching those universities.
I think it would be worth listing them if others find that useful. I fully believe a large percentage researching YC wants a comprehensive list. If you look at the famous alumni lists on Wikipedia of universities, you'll see quite a few lists of over 100 people (some famous; some obscure). Having a large list isn't out of the ordinary. I think YC's page should restore the company list.