A lot of people seem to be struggling with this notion that he did it for money, perhaps because he claims he didn't. But that's not consistent with the rest of the article, so why should he be immediately believed? Just because it's a nice story?
From the article:
He had two kids soon after World War II, but couldn’t tell them or his ex-wife about his underground work, so they didn’t know why he rarely visited. Girlfriends assumed he was absent because he’d been cheating.
His business took him away from home so frequently that he was unable to maintain stable relationships at all until he quit for good. We can deduce that forging documents was therefore not a rare occurrence - it was happening all the time. It also seems to have involved a lot of travel, which in the years he was active was nowhere near as cheap as today.
He estimates that in 1967 alone, he supplied forged papers to people in 15 countries.
Not to 15 people, but people in 15 countries. That does not sound like a small operation.
He went on to forge papers for people in practically every major conflict of the mid-20th century.
Forging passports that could pass muster around the world for decades on end is not something one does as a hobby. It takes significant time and presumably in the later stages serious lab equipment. Given his post-forging career as a photographer - not the most lucrative of trades - where did he get the money to fund his forging activities if not by charging for it?
It is difficult for me to reconcile this self-proclaimed image Kaminsky projects of a hobbyist who neutrally saves lives out of the goodness of his heart, with all the other evidence in the article that he was both highly political and running an international criminal operation up until the point he got scared of being caught.
The only evidence we have of his noble intentions are what he says they were. And just in case we think he's a humble and modest person, from the book website:
“My life as a forger is one long, uninterrupted resistance… against inequality, segregation, racism, injustice, fascism and dictatorships.”