I have used it for years. I have been on a couple of crackers in the last week in Brittany. You do not have to buy anything but I usually do, it's the done thing really. At the end of the day it will be something I would be buying anyway,cidre,calvados,wine, cheese, oysters, garden veg.I wouldn't stop somewhere that sold for example, hand knitted sweaters if I didn't want one.You get to meet some really nice hosts and consume some great produce in sometimes stunning locations.Some of the hosts don't even have anything to sell you and others are fellow camping caristes with a bit of spare land they are willing to share.When you join, the new app.enables you to look at each location and see if you fancy it. Be prepared to get drunk with the odd farmer and his wife,can't recommend it enough.2200 hosts this year,it runs April to April.Hundreds of vineyards and cider orchards.