Multiverts

Televised global sporting events (such as the World Cup) make a huge amount of money from television advertising.
During commercial breaks, these are usually specific to whatever country or region the game is being broadcast, however during the game itself, the pitchside advertisements are not so specific, and so for a large number of viewers are completely irrelavant.
Most of these advertisements are shown on digital boards, so I propose that a number of different images be cycled very rapidly (several times a second) with each image showing a region specific brand.
This would then be recorded on a very high speed camera, and each region could broadcast the specific frames that relate to their area.
In it's simplest form, a football match between two countries would have two separate sets of advertisements that would alternate.
If the board switched between the 2 every 60th of a second, a camera capturing 60 frames a second could produce the 2 broadcasts at a respectable 30 frames a second.
The number of regions that could be catered for would only be limited by the refresh rate of the boards and the speed of the camera.
One downside would be that supporters in the ground would not see the advertisements, but the extra TV exposure would more than make up for this.
Supporters could be made to wear special glasses that are tuned into the board cycle, but that's another idea for another day!