TV ads

Television Adverts, they're on every 15 minutes and last for 4-5 minutes.
and what's the deal with the majority of them being shown at the same time?
you get alot of people who get annoyed by adverts.. these are the people who always have the remote in their hand or nearby ready to change the channel or mute the bloody thing.. adverts.. They're irratating, loud, noisy, repetitive and inturupt ur favourite shows and interesting parts of movies. so starts the channel surfing- trying to find something to watch in the dreaded three minit interuption but all that is found is more adverts which makes you flick over more channels just to see more adverts. Very annoying. On the other hand, the individual sees a much wider variety of adverts and problably about 20 more. Not only for the big companies and their products but also for the channel's future shows.
So, synchronised adverts, annoying or cleverly controlled? Probably definately both