Since it's theft, I really don't find it "funny" myself... Generally I don't think things are put back in that are superior to what was taken, and in my experience they don't generally sell either, clogging up more stuff from coming in. I just look at it as sad more than anything. Pathetic... If you're that poor, you should probably just quit collecting and focus on things like food, utilities, and such.
I've found if you give it to management, point it out, it doesn't come back out onto the floor... It's just sad that you're seeing it more and more now, and it seemed to really spike in 2008 I noticed, and has just continued from there.
I'm not sure I'd consider what's in that pack worth buying and keeping compared to getting the TFU set of figures it should have, but some of the figures are ok ones. Nothing I'd call rare or even tough to find, but not all POTF2 stuff either I guess. I just don't see it as good I guess, but that's me.