The questions appear similar. Whether off-track betting should be legalised is simply a matter of the social good. Whether prostitution should be legalised isn't simply a matter of the social good. Legalising it would send the message that women, at least in this context, can be reduced to objects, tools and toys.
Grace is a person.
Grace is the presence and power of the Lord Jesus Christ as he acts upon us graciously. Grace is the presence of the living person of our Lord as his mercy and truth become effectual within us. We use the word in church-conversations in such a way as to imply that grace is a substance, stuff, matter, something that resembles the contents of a hypodermic needle. The foundational affirmation of scripture is that our Lord himself has appeared for the salvation of everyone. Grace is the cornerstone of the gospel-message.