I'm working through clicking everyone's eggs now.
'New releases do not accept click boosting items until either a few weeks have passed, or a new dragon is released on the site.' - From the wikia.
Also, if you want your eggies to hatch REALLY fast sign up for
Yarolds. It's a click exchange site. You can use it for dragoncave as well. In order to get clicks you have to give clicks. It is a little time consuming. I only do it when I want to hatch something quickly.
