In Television advertising they use something called GRPs which takes a population sample and calculates the audience reach and viewership of TV shows and then applies it to a large area based on that sample. It isn't 100% accurate obviously, but it is close enough for advertisers to use it to spend billions of dollars per year in Canada alone.

I feel something like this could be used to measure digital sales, but it will take a ton of work to put together. 

That question has been answered a million times and if you go to any country's sales like this one http://www.vgchartz.com/weekly/41945/Global/ it says "The week's top-selling games at retail ranked by unit sales"

You asked the quesiton. I answered it. Sorry if it hurt your feelings but it only takes 1 second to find this out It didn't deserve a thread and especially not from a long-time member.

How would one track digital sales? o.o

Didn't hurt my feelings at all, but you did look like a major wiseass.

If you don't like a thread, just move along. There are lots of threads trending right now where they are discussing pixel counting or bickering about made up sales figures where you can go and waste your time.

Now you're claiming VGC figures are made up?

Well now you've just stepped out of line, sir!

This site doesn't really "track" anything per se.

haha...reported? incoming ban hammer?

One option could be using the power of mathematics and surveying.

On the PC, users could install a program that tracks what game you're playing, similar to how companies track who-watches-what on TV, people opt into having their viewing habbits recorded.

It's not impossible, but is it worth it?

I'm replying to a comment since you replied to me. That's it man. Hopefully next time you take a second to think about the topic before making a thread. As for there being other threads, I'm off to one of those right now. Goodnight.

No, since none of that is really reliable.