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I got Roger Daltrey of The Who by trying a MovieEye address that hadn't been used yet. Got my photo back in under a month with a great personalization.
I'm about to use an address like that, I think it's good to try it. If no-one does, we may never know if it's a good address or not. And some celebs only have 1 address, because there not "that famous", so that would be the only address their fans can write to. Or try to. So sometimes it's the only way to try and get the autograph.
Yes there have been many times when I have tried an untested address or an address that I have found myself. I have received some amazing successes, but there are also some that I have never heard back from.
I always do a little research first however to find information of some kind which verifies for me that the address will have a chance of working, I wouldn't just send to any random address.
I send to many untested / no feedback addresses by doing so I add to my collection. I also have tried many that are not listed in the database at all, and if others want to try (and I have been successful) they might have better "luck".