think stevie does this

[olive]

The rider also alerts promoters that they may be required to hold back tickets for concerts so that Perry & Co. can provide the ducats to “resellers” for “distribution to the public” on the “secondary market.” In other words, Perry reserves the right to pocket some of the proceeds from the sale of tickets--not made available at face price to her fans--scalped at inflated prices by these brokers.

http://www.thesmokinggun.com/backstage/divas/katy-perry