advertising is a depressing middle-man work that no-one needed but it exists to lure its customers with the promised possibilities of increased revenue. Something like "Hey you wanna make more monies? give me some first and then I'll give you the possibility of making more money with my XYZ scheme".
The problem with the current XYZ schemes is that they get outdated as soon as users get used to it. Its like a bonfire, you need to keep bringing the woods and other stuff in the fire to keep it burning.