I confess that I keep a drawer full of them. They can come in handy when you lose the wall wart to something else, or you want to experiment with a little ARM-based gadget or whatever.
What do folks do with old SMPSs?
Like many others, I’ve slowly replaced SMPSs throughout my system. As a result, I have a box of unused SMPSs - some stock, some iFi, etc. Keep? Toss? Sell?