A valid question in return would be, "Do you know how many people don't know what the Humble Bundle is?"
Moreover, what percentage of the population is even aware that A) you can buy games to play on the computer, and B) that didn't come from a big box retailer? I'll tell you this -- it's very much in the minority, especially when you look at the 30-and-up crowd. Much older than that and the percentage of the population starts to approach zero.
I grew up with an Atari VCS 2600 (that my parents had bought for themselves), as did most others I know. However if I asked my parents -- or those of anyone I know -- what Steam was, they wouldn't think of anything other than water vapor. Humble Bundle? Not a chance.
I've heard of kids on the bus and subway recently, talking about "this new Steam thing". If kids aren't aware of it, how aware is the general population of something far more obscure? Not very.
Right, but we're on HN, and Humble Bundle Inc is a YC company that gets on the front page with some regularity.
I'm sure I'm in a bit of an echo chamber, but it just seems strange to me since it's been so widly discussed here and in other places I frequent (e.g. reddit - another site I don't expect my parents to know but would be surprised if the common HN-er didn't hear about it).
Just my opinion, but I too didn't know what voxatron was until I played the video (which was great, by the way). I know what the Humble Bundle is, but I think what threw me off is that I usually hear it referred to as "the humble indie bundle", and since it contained neither the words indie nor bundle, I assumed it was somebody using intentionally similar phrasing to promote an unrelated product.
Remember, even if you've been exposed to something in the past, it doesn't mean you know what it is. I clicked on the article on the HN page, by reading the title, and didn't see the domain until I went to click on the back button. I can't say that I didn't have any inkling that it was a game, and whether it was from the mine craft like picture or the url I can't say (though I don't know for sure that humble bundle is only games.)
IF people are tweeting this page, how many people who see that tweet are likely to follow it and have never heard of Humble Bundle before? So, they'd know even less than I would...
This Humble Bundle is a bit of an abberation; normally the deal is like 5-6 games for pay-what-you-want. So the value proposition is normally a lot better - "dude I can get SIX GAMES for like TWO DOLLARS!" and that tends to be enough to draw you down to click on the games' icons and find out about them.