There are some other benefits depending on their local regulations. I think it was in Sevilla, where our guest house owner told us that there was a discount for entrance fees too. My wife asked at the ticket window and was told we didn't have to pay anything. Children were free regularly, but along with the disabled person, one attendant was allowed free entry too. Sometimes its not possible to avail of this facility even if it's provided, if you can not negotiate the stairs, for example.