It's a tough life working for JAMSTEC. Here's my desk on our last day.
By the third from last purchase, when we were told to buy new computers if ours were more than 3 years old, because there was too much money to spend, I'd run out of good names and called my new Mac Pro "MACXS". The only mitigating circumstance is that these are the sum total of both our computers. The oldest dates from 2008, which is a long time in PC world, but Macs almost all just keep looking new. One is broken beyond repair and another so well used that it is held together with string and sticky tape. But another only has a dodgy trackpad, and the iMac's disk blew up a few weeks ago; we would have got that fixed if we were staying.
So what happens to all these computers now? Usually when someone leaves, precisely nothing happens. We have been there longer than almost everyone, and since our research was so fundable, we had three large budgets we had to help spend on our really rather cheap science. Computers and travel are what we bought. So I think we have accumulated more than average. We have at least got someone in another program interested in taking the latest two laptops. But I don't hold out much chance of the Mac Pros going to a good home - everyone will want the new style tiny black desktop thingie... I prefer the old one, as the modularity was very useful for spending up budget. Buy a base model one year and then ramp up the disks, RAM, graphics whenever the budget demanded to be spent. If only the motherboard could also have bee upgraded...
Things are going to be different now! We have a beautiful second hand laptop from Akihabara with his'n'hers partitions.