People often ask if I believe in god. I used to dilly dally in answers till I realised. It does NOT matter whether I do or not. By the time I find out it will be too late to change any decisions made that would've depended on my belief or disbelief.

Instead, I choose to live a life that mostly is good, not coz i'm afraid of a supreme being, but just coz I think that the very basic laws of existence, eg, every action has an equal and opposing reaction, apply to everything. If I slap someone today, I will be slapped back, before I take my last breath.

So, applying this to astral projection, I'd say that I give the benefit of the doubt to people who say they have done it.
I was doing a really really long drive in Australia and a conversation got going between me and Dave, someone I had just hitched this ride with. He said he could astrally project and his mum could also do the same.
He gave me an example of how he had used it. There was a child in a nearby house that was having trouble with a ghost that would bother the child in the night. The child had told his parents that someone was talking to him in the night. They didn't believe him, but as general conversation, mentioned it to Dave's mum who told Dave.
Without discussing with the family, Dave astrally travelled to the house at night and says he met an old man in spirit form who was talking to the boy. He asked the spirit to stop as it was distressing the boy.
Apparently, from the next night the kid stopped having trouble sleeping and never mentioned the old man again.
Draw your own conclusions, but for me that is a sweet story! IF astral travel exists than that was a cool use of it. SO, I refuse to write it off, simply because SCIENCE can't prove it.