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Dots in your gmail

Google help clears up a mystery for me. I often get emails meant for other people on my gmail account. There is always one difference between my gmail address and the mistaken one - a dot. Google has set up things so that adding or removing dots from the name part of your address still directs mail "properly". So if you register the address yourusername@gmail.com then mail sent to y.o.u.r.u.s.e.r.n.a.m.e@gmail.com also gets to you.

This is an interesting choice on the part of google. I can't think of a good reason why you would do this.

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