Makes a lot of sense, really. They will not have to handle loose change at all. No reason to issue silver change to all gate cashiers, although they might issue some to one cashier, just in case.
As far as the "old retailer's trick", you're probably right. At this point, no one is going to quibble over 5 cents, and no one will be fooled either. :)
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Timothy A. Bretz
"Remember to pillage before you burn"
http://ourworld.compuserve.com/homepages/tabretz