Despite your condescending tone, I agree with the premise of your argument. But it's not like buying music from the distributors will help the artist, so the reasonable alternative is to get it from the source or not at all.
Meanwhile, the artist is in a position to increase their demands related to this follow-up effort, so saying that the publisher's success has no bearing on the artist's isn't correct. Yes, the artist has to negotiate well and produce more to realize that benefit, but the absence of a clear path isn't the same as the absence of any path.