Ananias got a bunch of Macs with Quadros and wants to know if they're worth anything. Leo says he can go to EveryMac.com to see their history. But they run a PowerPC chip, and as such, aren't really supported in the modern computing world. Likely, they just fodder for eCycling. However, it is still worth checking out eBay to see if there are any opportunities.
Bob wants to know what he can do with an older MacBook Pro that can no longer be updated. Leo says he could possibly use Linux on it, but only a few installs will work with Mac hardware. Kubuntu and Xubuntu are examples. He could also continue to run it as is and just use it as something else, like a file server, or he could donate it.