I once received an email from an academic in a field close to my field where he offered 70$ for every time I would cite one of his papers. I never responded to

I once received an email from an academic in a field close to my field where he offered 70$ for every time I would cite one of his papers. I never responded to the email but I imagine that many would be tempted. I can only imagine him showing off how influential his work was when he asks for more grant money... maybe he was even funding this "campaign" of his with leftover grant money as an investment... I believe this to be a somewhat clear example of how measuring people can lead to strange behaviour and rushed work at the cost of quality.