What is also striking about the African-American woman is that the cartoon alludes to the widow's mite story from the gospels (cf. Mark 12:41-44). The implication is that 22 cents is all this very poor woman has (equivalent to $3.10 in today's dollars, adjusted for inflation), and she is willing to give it up in order to own one of Judge Rutherford's books. That was enough money in those days to buy a ham sandwich. But Rutherford's life-giving publications are worth more. 
For me, this cartoon suggests better than anything else in the picture (1) Rutherford's ego and (2) the focus on $$$. Elsewhere, we find other (more fortunate) ppl discussing what a steal it is to buy Rutherford's books for $$$ (or "wait until I get some $$$"), and other ego-inflating statements, such as "Judge Rutherford could not write these things unless he were used of God"....
For me, this cartoon suggests better than anything else in the picture (1) Rutherford's ego and (2) the focus on $$$. Elsewhere, we find other (more fortunate) ppl discussing what a steal it is to buy Rutherford's books for $$$ (or "wait until I get some $$$"), and other ego-inflating statements, such as "Judge Rutherford could not write these things unless he were used of God"....