If you're selling your car, are you going to personally warranty the drive train for 90 days? Another twenty thousand miles? Unless your a crack mechanic or you are on crack would you even consider this. Same thing, folks. Who among us knows enough about each piece of gear we have to know when trouble is ahead?
It's one thing if your equipment has an issue and you keep it quiet from a buyer (there's a special listening chair in hell, hopefully). But to expect the average schlub to guarantee something he owns is asking too much, especially if he's not the original owner. Why do you think the pros only offer warrantees to first-person buyers from a dealer - because the custody chain from factory to buyer is a known and can be attributed to the manufacturer.
It's one thing if your equipment has an issue and you keep it quiet from a buyer (there's a special listening chair in hell, hopefully). But to expect the average schlub to guarantee something he owns is asking too much, especially if he's not the original owner. Why do you think the pros only offer warrantees to first-person buyers from a dealer - because the custody chain from factory to buyer is a known and can be attributed to the manufacturer.