I have always taken Stack Exchange as a serious place, for serious problems involving serious problems.
"SO" when I saw Unicoins for sale, I took it seriously, even though my friend just send me a message how his staff tricked in into thinking his server got hacked and bitlocked... (Look I even mined 1)
OK- And they went to the effort to actually implement the stuff you can buy into the site. LIke colorful comments.
Well done :)