I think the point Bukowski was making is that Martin wasn't shrewd enough. He's talking about the modern equivalent of $15k a year from Black Sparrow in 1981, which absolutely would have qualified him for food stamps. And also note that he was making the same amount from BSP three years earlier, in 1978.
The BSP money certainly wouldn't have bought him a house and new cars. Foreign royalties did that (in 1982 non BSP royalties were 15 times his take from BSP). It took another 10 years for the BSP money to get to that level.
Martin likes to talk about how much money Bukowski was making at the end of his life, but it's not unreasonable to wonder if Bukowski would have even made it to 1994 if he was living on BSP royalties alone. He would have still been in Hollywood, living in a cheap apartment.
I'm not trying to downplay the importance of BSP in Bukowski's life. I'm just balancing out the (many) people who overstate it. And I still maintain that had Martin not showed up, someone else - or some other publishing company - would have. It's a romantic story, Bukowski and Martin. But Martin/BSP alone wasn't enough to take him out of East Hollywood. Not until the last few years of his life, anyway.
And - I meant to stop a while ago, really, but - you could also reasonably argue that Bukowski's foreign fame went a long way toward making Black Sparrow what it eventually became. The Barfly movie really put him on the map as far as the general public goes, and Barfly wasn't made by an American. It wasn't sold by Martin.
This could go on indefinitely, these connecting threads and what, exactly, was responsible for what. The fact is everything was responsible for everything else, and it all boiled down to the man and his work. And that he continued to work, no matter what else was happening in his life.