If you read the article, it very-much sounds like money was a secondary motivator, the first being their desire to, “liberate the medical profession from government and industry conflicts of interest”, as it's quoted. Normally I wouldn't take this on face value, but it says they sold the fake vaccine-cards for "either $50 cash payments or 'donations to a specified charitable organization' ". So it really does sound like these people were delusional enough to think they were doing something righteous.