Is distilled/deionised water a scam?

[JimClark49]

Went to my local motor factor to get some and the guy told me its a waste of money. He said it is just boiled water and is nothing more of a scam.

Is this true?

[JimClark49]

Thanks for the replies.

I actually bought it for my cooling system on the motorbike (with an aluminium radiator). So it seems the consensus is that it is worth buying and is not a scam.