Department store manager: There is absolutely no reason to offer our customers free gift wrapping again this holiday season.
Evidence
If most customers take the offer (free gift wrapping), it will be expensive and time-consuming for us.
On the other hand, if only a few customers want it, there is no advantage in offering it.
Conclusion
There is absolutely no reason to offer our customers free gift wrapping again this holiday season.
Evaluate
The argument points out two extreme cases where there is no advantage in offering free gift wrapping this season. But there are other possible cases. If the number of customers is more than a few and less than most, there may be good reason to offer free gift wrapping this season.