Speaking as a writer, I honestly think that these are more likely created because it's what the writer wanted to do, rather than the money. Considering the fact that making a remake is always a risk, because not many people like them, it is more likely they are doing it "because they can" rather than thinking of the money.

I'm sure no one would scoff at the idea of making money, but when it comes to writing it is usually more because you wanted to do it (and take it from someone who is interested in doing his own version of things - remakes, adaptations, and the like can be fun to make, at least I find them fun).