To avoid people coming to your store trying to redeem what they “think” is your offer, as seen on the back of a Safeway receipt:

adSix packs of beer for $10.20? That IS quite the deal.

An editor might have looked this over and added  a simple hyphen in there to make it read “6-packs of Molson Canadian $10.20” And yes, maybe we would have charged a few bucks for service of inserting the hyphen – but would probably save the business a world of grief, because the store clerks wouldn’t have to waste time arguing with drunken cheapskates that the Best Deal in Town!! just isn’t quite that good.