Eu2 is about same level as diplomacy, victoria and ck. eu1 did better.
I doubt it would have sold more at any price. The market for deep rigid historical event games are not that huge as we've noticed. I'd have hoped that an EU2 remake to a forum that was so in uproars over Eu3 going sandbox would sell at least a 1/20th of an average EU3 expansion.
EU1 did better ??? That's a revelation. I thought that "you cant annex superpowers" rule would have made a difference in favor of EU2.
As for the "sandbox" character of FTG, i believe it would have mattered more if it was released 3-4 years earlier. Older board members still remember the modding craze surrounding the AGC vs. EEP "rivalry". I believe it would have been gold then, but in 2009 why would someone invest 20 euros in FTG, when he could just invest a bit more and get sandbox EU3? After all, we had modded/played EU2 to the death at that point...
But seriously, 1/20th of an average EU3 expansion? That's noteworthy to say the least. Could you give some rough numbers for us to make a comparison?