You can't monetize invitations because the guy that sells you the invitation could take the money and then kill your identity and also steal your stake during the first 3 epochs
That's the whole point glad that only one guy has this mindset of selling a code, we should educate people and ask them to undergo a test first before trying the actual verification, but not selling the code to them it's an invitation to scam people and it will give Idena a bad reputation in the community and it's a bad start for us.