Why didn't the creators call this Big Bang coin instead? All coins are created almost at once, enticing miners to mine this.
Then after 6 months, oops, party's over. Many coins have come and gone, let's see what happens with this one.
And Zetacoin has failed. Party over after 1 year.
Besides, when the party was on (1st 5 months) the prices where at an all time low. The miners sold their coins.