In my experience, speakers don't die quite as easily as some are suggesting. But when I buy older stuff, it's at a price point that keeps them from being a bad deal even if they die in five years. Example: I bought a pair of Revel Concerta F12's, which were probably 15 years old. They work great, but I got them for $700, so if I only get five years from them, they'll still be a good deal.
But I'm already struggling to get parts--an attempt to buy a replacement set of carpet feet has gone nowhere. They identified some stock in the UK, but even with me willing to pay three times their price for shipping, I can't get anyone at Revel to lift a finger to make it happen. That's why I don't sell my old Advents, which seem to be indefinitely repairable.
Rick "for whom buying old stuff is part of the hobby" Denney