in 96 and 97 (not in 98 yet) I received some UA-"brownie points" and I gave them regularly to "my" UA-employees in Switzerland (rarely also at other places).
UA-people told me then, that they enter a ballot with attractive (and unattractive) prices - but were quit keen to get them.
Already than a mileage plus number was asked for on these "brownies" - to help against fraud of UA employees filling them out themselves ?