Just one more thought here. Last year on the CDP Conference, the GOG team showed an alexa internet statistics as kind of traffic (=buying interest) measurement. This year they didn't but we can make it. It's of course only of restricted usefulness but for the fun of it: :)
GOG vs GamersGate
GOG outrunned GG in fall 2010, GOG is further increasing
GG developing laterally with large fluctuations
GOG vs Direct2Drive
Direct2Drive used to be top ... before 2010, but since then a decline for D2D and an incline of GOG brought both to roughly the same level
GOG vs Steam
Steam is simply Goliath and GOG David or so it seems. However looking at it the other way: there is plenty of improvement for GOG. :)
Note: Of course the traffic rank does not mean that all of these services cannot grow at the same time, only that some are not growing relative to the other sites of the internet, but in absolute numbers all DD services could. Second, the Alexa statistics might be erroneous, since they (through their toolbars) watch only tiny part of the overall traffic. Third, traffic does not directly translate to sales.
So, considering the note, we can only conclude that:
- GOG is increasing exponentially (logarithmic scale)
- GOG is probably on a similar level than GamersGate or Direct2Drive
- GOG is way below Steam
Or even shorter:
For the moment GOG is doing fine.
http://www.alexa.com/siteinfo/gog.com