Yes. Put yourself in his position; how would you react if the seller of an item you were interested in reused to divulge fraud-proofing info?
Relax - it's a serial number, not your bank account. As a previous poster said, there's nothing the buyer could do with that information to hurt you.
he can do 2 things with it:
1. Check warranty coverage at apple.com
2. Scam some other guy on ebay into buying a fake mac from him by giving your serial number to the buyer
He cant do anything to hurt you, its just a serial number to a computer.
Nope... not exactly true. The wrong person with the right information could... setup repairs under that serial number (if they work at a service center), look up your personal registration information (if they work for Apple), etc.
Now, these aren't likely to happen, and may not have direct consequences... but... I'm just saying... never say never...
It doesnt matter if they do or not, when apple doesnt recieve the computer they will cancel the service... if its even possible to do it in the first place with just a serial number.
They cant victimize you by getting your computer's serial. Theres no way for them to order services that youll have to pay for and theres no way that they can take your serial and use it on another computer for apple care. Fraud is impossible here, the serial number has very little worth outside of sending your computer to apple to make sure its still under warranty, infact thats probably the one and only use for the serial.
If serials were delicate information then they wouldnt be labeled on the outside of the case for everyone to see.
... you cannot report a computer stolen to Apple, so the buyer would have no way of finding out whether the computer is stolen or not from the serial number.
You make it sound different than it actually is.... I wouldn't be telling people my car's VIN over the phone if I was selling it...
I don't think you quite understand what I'm saying. I never said they can make you pay for service. However, I'm stating what's possible. For you to say that "fraud is impossible" is really funny. Fraud is almost always possible. You, as the actual owner may not be affected, but Apple might.
For instance, if I have a serial number to a computer under warranty, or under Apple Care, I can call Apple Care (possibly have to pay $50 for support if it's just under Limited Warranty and not AppleCare, but they waive this pretty easily)... and I can make up a story about how some DIY (do - it -yourself) part has failed, like a power adapter. So I'll have Apple ship me a replacement adapter, and I'll ship them back and bad one. You don't lose anything, but it's fraud and Apple pays the price.
A second thing that can happen, is that someone sketchy that works for an Apple Service provider, can order a part under that warranty for someone else who's computer may not be under warranty. For instance, a hard drive. Again, Apple loses, not you.
And then, lastly, and again REALLY NOT LIKELY, an Apple employee can look up your serial number, get your registered information (address, phone, etc, etc...). There are a million things that can be done with that info, both malicious and not. But since we're talking about the far end of possibilities... let's say they take that info, call your number, and say they're Apple. They want to remind you that your warranty is coming to an end and would like to offer you a special price on AppleCare. If you say yes, and they get your credit card info, that's that.
SO... again, these are just possibilities. But they're really really not likely. And I've given several serial number out myself. But, decisions are best made when you've got all the info available... and if you just listen to people telling you that "fraud is impossible," then you need to be a bit more careful.