In most places where there is more then one person invloved (at the parking lot, the bell staff, etc) they pool the tips and then split them at the end of the day or whatever.

I don't feel that a tip jar at the deli (or many other places) is out of line at all, nor do I ever feel that I am expected to put anything into it. Every now and then I will, just like every now and then I use to let them keep the change, but just because it's there doesn't mean you are required to put something into it.