The internet is full of scammers and spammers, GAG is not immune.
When you see those kinds of posts, or receive messages of that nature, we'd appreciate you helping us out by Reporting that user from their profile, selecting reason "Spammer". Also, report the post itself, "Spamming".
This will help us get rid of them as quickly as possible, so they don't have time to flood the site with nonsense :-)
I've known new used on the site looking at my profile and saying they were "interested in me". They had never asked or answered any questions so were abusing GAG as a dating site. I don't mind if a person I've known and spoken to on GAG for a long time, proposes to get in touch. So, as other GAG'ers advised, report the person to an administrator!