During our years of full time RVing, we visited just about every museum we found, only a couple of beer breweries, and several wineries. In each of the wineries we visited, admission was free, and free samples were offered, and I bought a little wine at each one EXCEPT one in Sauk City, WI. That one had a $6 admission charge and I did sample some of their wine without finding anything that I would have carried home if it had been free. I'm sure they knew their wine was so bad visitors weren't likely to buy any, hence the admission charge.