Earlier quoted context omitted.
My understanding was that Dogecoin doesn't want to become a "serious" currency and the sentiment in the community against the BTC-community is that they take themselves far too serious. This decision makes sense if Doge intends to stay the "great comment, I give you 10000 doge for that" fun-currency and drive out everybody whose primary intention is financial gain.
If the coin has no value, you might well just say "great comment, I give you 10000 doge for that" without the hassle of actually giving doge. Why have a whole system that accomplishes no more than merely typing the words did? Stick with the words. Easier, faster, just as much fun.
Easier? Yes. Faster? Yes. Just as much fun? I don't know. Psychologically a Doge has still more perceived worth than than karma. At least to me.