This in my opinion is one of two things... 1. The person is part of a group of people that does this with different addresses, to add spam to the network. If I am correct, you would find more of this
during the same period, but with different address groupings. In this way, it does not look as if it is related, but it is part of the same attack. Or 2. Someone is using this as scam, to show payment
proof, but the money ends back in his/her own pocket. You would have to be stupid to fall for that, but people tend not to look any deeper than the surface.