I think it's a good deal, and they don't take up much space. Probably more than you'll ever need (unless you get a lot of the old machines that could be maxed out with them as mentioned before), but they sound like a good thing to hold onto for future trades or sales.

Then again, I've got hoarding tendencies when it comes to Apple stuff. I've got a whole box of NOS microphones in the basement as one of many examples...