He is helping to promote your page and expand your viewers. If you choose to message and get mad that he won't pay(for what exactly) you have no one to get mad at but yourself.
Not ever male who is submissive is a "pay pig". This doesn't mean they're broke or cheap. Not every kink is everyone's cup of tea. If a submissive doesn't message you first, but follows you and shares your content, it is a sign of respect. He isn't wasting your time.