We try reply to messages even if its a polite no thanks.
But when its clear that the person has not even bothered to read our profile, so we ignore those, others are crude , yes we play but that does not mean we common and crude so we simply block the crude replies without blinking an eyelid.
Unfortunately by replying with a "thanks, but sorry we decline the offer" for some leads to a debate on why we should and must.
Another one are the friend request without even a basic hello and introduction, they get declined ASAP.
But never the less we try respond to messages, but then we not on limited messages like the non gold profiles.