Valid point (and one I initially did not consider). But I still stand by what I said, although I admit it can be more flexible if you're contractually bound to write a series. Maybe a few years' worth of extensions per entry or it starts after a series is over? Certainly not 70 years after an author's death. We know books depend on popularity to sell, and we've seen only a few (relatively) authors get rich on their books alone.

10 years is a long time - I would not stay in a job that doesn't pay enough for my needs for 10 years no matter how much I enjoy it. My problem is I admittedly am not well-versed in that specific industry (trusted resources are welcome as I've tried searching but I don't recognize many of the websites so idk how reliable they are). But an increase in salary (or advances) and/or royalties may be in order. I think everyone is entitled to that at this point.

Again, this is from my admittedly limited knowledge in that specific industry, so feel free to correct me. It's just that imho IP rights, as they are today, is kind of ludicrous.