I don't think you read your own wiki

"Bitcoin has some exposure to fraudulent double-spending when a transaction is first made, with less and less risk as a transaction gains confirmations."

The whole point of balling up transactions into a block is to agree they are not fraudulent. And that agreement doesn't happen for up to half an hour. Thus, the exposure prior to that while not interesting for a cup of coffee is very interesting for $100 worth of liquor or a $1000 handbag or the majority of other point of sale purchases now done with credit cards!