Tim, I'm sorry but I do not agree about a 3 - 5 year life for my recording equipment....
Sorry too, but talk to me about compatible full-length IDE cards, SCSI devices, ADB interfaces and stuff that doesn't work on OS's past Win2k or MacOS9. Often its not just hardware but the drivers aren't updated and won't work on modern OS's. Mac users have just gone through the switch to Intel chips where old PowerPC programs wont work on the last two OSs and Windows has been threatening for years to rewrite an upcoming Windows that'll be completely incompatible with new hardware.
I'm not talking about audio gear that is simple line-in to line-out, but stuff that hooks up to the computer.
And that all goes antique.
Often as in "sorry, mate, but that won't run on your OS."
Now I'll admit I'm still running my Motu828mkII from 5 years ago, but even that's getting long in the tooth these days and I'm going to have to look to something new in the next few years.