He just wrote me two PMs, with the same content, within five minutes of each other.

I won't reproduce the PMs here, but he basically says he is the same person and has lost access to the address to sign the message with.

Deep down I feel a little sorry for him.

But we see a lot of cases on the forum of wanting to take the fast track to make money, and that's not how things are done.

In this forum you can earn money by being a decent person, without cheating, without buying accounts. There are countless examples of this.