About: http://webisa.webdatacommons.org/371238311

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	First, like you said, they are incredibly expensive, second, you have very little control over where your links are posted, which could result in banning and other problems.
http://www.w3.org/ns/prov#wasQuotedFrom	johnchow.com