Something better than nip05 is needed to prove authenticity. Maybe it's web of trust. But point is if you pay to fake a user, and then you get muted, all you achieved was to provide some free promotion for the real user.

Want to do an experiment? Say I want you to make a post that defames Ross Albricht. It is a logically sound argument, but you normally wouldn't say such a thing yourself due to whatever bias you have. To fill the gap of the bias, a negotiation or offer is made to 'get the word out'. Well, now I am incentives to accept the offer. It sounds rational on its face, and I could use the money.