It depends if they ask nicely. I had a kid from the other team ask me if he could have a mags worth last Sunday while we were changing ends. He was a good kid. I couldn't say no. If he'd been all chavy and a bit gobby it may have been different.
I don't tend to agree on the theory of what goes around comes around as I seem to help people a lot in life and get my fingers burned. Bu I will keep fighting the good fight!