I read the posts above and I have a thought here...
The conclusion is NOT publishers are more interested in making money. Rather, the conclusion is that publishers now are more interested in money THAN in good books. There is a comparison here.
The core of the argument is:
P1: In the past publishers sometimes published books that were of intrinsic value but unprofitable.
P2: Nowadays they published fewer of these books.
C: publishers now are MORE interested in money THAN in good books
The answer choice (c) says in the past those books were often lucrative.
IMO, if the conclusion is simply publishers are more interested in making money, answer choice (c) might be a weakener since, if (c) were true, the publishers at this time are probably LESS LIKELY to be MORE interested in making money because they are publishing fewer of those lucrative books instead. It becomes harder to infer that they are more interested in money if they are doing something that is contrary to their interest - making money.
However, if the conclusion is that the publishers now are MORE interested in money THAN in the quality of the books, then (c) would not be a weakener.
If (c) were true:
P1: In the past, those guys published lucrative books that were of intrinsic value.
P2: Now, they published fewer of them.
At this point, we cannot say whether the publishers are more interested in money or the quality of books since they just publish fewer books that are both profitable and of intrinsic value. It is hard to guess which one is more interested to them.
Please correct me if I made a mistake. Thanks in advance!