How important is security for wireless systems?

I recently got an airport extreme and an airport express. to make them work with my old g3 (OS 10.1) I had to remove all security/passwords. This was at the advice of the Mac genius. He said people could leech my bandwidth, but not corrupt or read my activity on-line. Is this true? If not, is there another way to ad security for all my computers?
Thanks for your help and advice.

waxy, Welcome to the discussion area!
He said people could leech my bandwidth, but not corrupt or read my activity on-line. Is this true?
That is not true. If you are not using any wireless encryption then anybody can monitor all of your on-line activity and use your bandwidth.
If not, is there another way to ad security for all my computers?
Your old G3 should be able to connect as long as you are using WEP. But perhaps 10.1 doesn't have this ability. I would strongly recommend that you upgrade the old G3 to OS 10.2 or better. You will be amazed at the functionality, reliability, and stability added by OS 10.2.

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