WHY?

Have you ever noticed that in every pubs in the world peanuts are free, but if you want water you have to pay?. I think that this look like this just because peanuts are salty and after when you will eat it, your organism probably will need to drink something. This isn't the only way to answer this question. In the other hand, peanuts are the "partner" of beer, so conclusion of it could be like this - if there would be enough of peanuts, peoples for sure would buy more beer ;)