[ekanes]

They break out contributions by OS, which is kinda neat to see. Admittedly an outlier could move the needle if they really want to throw some money down.

~4k individual purchases.

Average contribution:

Windows $5.48 Mac $7.09 Linux $11.45

[wccrawford]

I made the purchase from a Mac, but plan to play on a Windows PC... Wonder if that skews things?

[JeremyBanks]

On your download page you can specify what OSs you want to count towards. It defaults to the one you purchase from, but you can change it or select multiple.

[pclark]

Is that because Linux is a much smaller % of purchase OS than the other two?

[tyree732]

Likely because Linux users are a: More grateful when games are made for their platform and b: attempting to demonstrate they are better than Windows and Max users.

[moondowner]

stats at the moment:

Average Windows: $5.69

Average Mac: $7.69

Average Linux: $14.17

As a Linux user, yes I am grateful! :) It isn't about attempting to demonstrate that Linux is better than Windows or Mac, but supporting the developers and making others realize that Linux can be good for gaming too.

[lionhearted]

Two more - Linux users more likely to be developers who appreciate the value of software, and probably more likely to be wealthy/educated/sophisticated.

[tel]

And because means are spectacularly unstable so just one or two feeling that way will show up.

[jmillikin]

The current statistics are:

  total revenue: $301,252.18
  number of purchases: 43,819
  average purchase: $6.87
  average windows: $5.72
  average mac: $7.72
  average linux: $13.72

Based on their "total revenue by platform" chart, I estimate the per-platform revenues to be:

  windows: ~54% , or ~$162,676.18
  mac: ~23% , or ~$69,288
  linux: ~23% , or ~$69,288

An approximate Linux revenue of ~$69,288 and average purchase of $13.72 gives us ~5050 total Linux purchases.

Now, it's true that a very large contribution could influence the mean. However, they also include a list of the top 10 contributions:

  top 10 contributions:

  $1,000
  $700
  $666
  $650
  $600
  $500
  $500
  $337.42
  $313.37
  $300

We can assume that every one of these was designated a Linux purchase, treat them as outliers, and remove them from the statistics. The adjusted statistics are:

  outlier revenue: $5,566.79
  
  adjusted total revenue: $295,685.39
  adjusted linux revenue: ~$63,721.21
  adjusted linux average: $12.61

So even removing the top 10, Linux users are still significantly more generous (on average) than users of the other two major platforms.

You could argue that a sufficient number of Linux users donating in the $100-$300 range could skew the results, but I believe such a high number of extremely generous users would prove my point anyway.

[tel]

Good argument. I buy it, largely because it wouldn't surprise me in the least if Linux users are actually more generous. I just often dislike data summaries. If you want to show me the data, show it directly.

[tibix]

In the first Indie Bundle [http://www.wolfire.com/humble], they didn't show these results until the last days, and the stats were similar. Linux Users weren't trying to show off, it was something that just happened.

[tel]

Means are still spectacularly unstable to small numbers of outliers. They're more stable with higher numbers of samples, but so is any given measure of centrality.

So, a few Linux users donating $500 could sway an identical distribution to the Mac or Windows users.

[smallblacksun]

Like the guy who gave $500

[MoreMoschops]

Also, the Windows guys have no money left from paying a fortune for their OS :p

[Deestan]

I think it's because Linux has a larger fraction of highly paid techies than the other platforms.