Any successful volunteer organization will tell you that if you don't appreciate your volunteers then people will go away and do something else. It is more than recruiting; it is just as much about retaining people. The fast path to retaining is through appreciation.
I suggest that each and every project have an appreciation page. I would like to read 'Applause Please.' But, that's just me. When your project needs to once-again recruit people, then maybe you'll bring the topic up in your leaders group.
EDIT: Thank you so much for taking the time and responding. Your points of view are appreciated all the more because they are different from my own elementary ones. You inform us all by typing alternative opinions.
How about this then? Each project has a thank you feed, just like each person does. How about if each project had an appreciation volunteer that could go through the list of thank you(s) and thank people?
Thanking is a part of the WikiTree way.
2nd Edit and Close: Thank you. Asking a group of Project Leaders to consider defining a problem, then coming-up with possible solutions must begin with appreciating the Project Leaders. To that I propose a special "'This person' is a Wonderful Project Leader" much the same as a "Wonderful WikiTreer."