Not a good idea if you ask me, here is not bitcointalk where one can either have merit to send out, or not have merit to send, karma over here is like a Facebook or Twitter like button, which means, users will always have the ability to send karma, they don't have to earn it first to be able to send, so as such, Karma on this forum is easier to abuse than merit on bitcointalk.
What you are proposing can easily been seen as a Karma abuse by the admin, admin already said it times without number that, when ever we see a post or comment that deserves a positive Karma, give it at that particular moment and move on, same way you like a post on Facebook or Twitter and scroll away.
I can speculatively tell you that what some members of the girls club did that made them lose all their positive Karma may or might not be far or too different from what you are proposing here.