I love buttons. I can easily spend quite a while sorting through the button jar to find the right button, and if nothing seems right I'll happily get extra sets of buttons becauseI can't be sure of the colour under artificial shop lighting. I seem to recall rifling through my mother's button tin as a child, just for the pleasure of looking at all the different colours & shapes, and still rather enjoy arranging them by colour, size etc.
Which is all a rather long winded way of saying that I probably have a rather excessive button collection. But as long as they fit in the button jar....
(I'm pretty sure I said the same when all my yarn fit into one plastic tub.)