It depends. If someone has said something horribly offensive and gets some GAs for it, I tend to think it indicates that some people must agree with it (because I can’t see any other reason to give an answer like that any lurve)*. However, if it’s a joke or just a well reasoned response, I don’t assume the lurve means anything more than some type of appreciation… not necessarily agreement.
*Except for those accidental GAs given when trying to flag an answer. I know from bitter experience that it happens!