I certainly agree with you, it sure is awesome!
But it's no puzzle... when a developer allows their game to be modded, not only are they upping the replay value, community mods can also increase sales for them. Look at ARMA 2's sales after the DayZ mod came out, sales for it skyrocketed and it was Steam's #1 top purchased game for quite a while (that's for a 3+ year old game too), and it's still within their top seller list.
More and more developers are becoming "Mod Friendly" now. And for our benefit, let's hope it continues.
tenofswords
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