Within the last months a lot of people reported this issue with their items. Few sales or no sales at all.
The entire market is on decline as I understand. For example my first approved theme after one month has only 5-10 views per day. So there is no traffic from themeforest at all 
Maybe because they introduced Envato Elements so they advertise this new market more than ThemeForest.
There is a topic opened for this sales drop issue: What happened to sales?! ( Sales Drop? )