jamyskis: You see yourself as being entitled to continued remuneration from past work, but does a nurse or a doctor keep getting paid for each life they save? Does a builder keep getting paid for a house he helps build? Does an architect get paid every time someone new moves into a house he designed? Developers and musicians often don't realise how much of a legal advantage they have.
Before I go into detail, the legal advantage you talk about only applies to big shots like Disney etc who can afford legal teams who do nothing all day but sue people who make Mickey Mouse gravestones.
Small individual freelancers like me who can't afford a lawyer haven't got many options beyond writing a polite cease & desist letter and humbly asking if I could please get a free copy of that role-playing book which has my stolen art in it? Sure you can join some unions and societies and make a little bit more of a racket but even so the results aren't proportionate to the lost time & effort.
As for visual art: If I sell someone a painting, I'm only getting a one time payment. The customer can resell the original work to anyone at whatever price they like (or tear it to pieces and feed it to the pigs for entertainment). Remuneration is only an issue if you want to print that painting on the menu of your restaurant or use it in any commercial way that doesn't just consist of selling the original piece. Many people don't understand that while they own a painting as a physical piece of work, the copyright is a completely separate thing that is sold separately. If you buy the full copyrights to a painting, you can then happily print and sell greeting cards and Christmas cards for as much money as you like. All depends on the type of contract you make.
Similar situation for architects by the way. You can resell the house you bought at any price but if you want to build an exact replica of said house using the same blueprints, that's a whole other story.
A nurses' work is harder than the stuff most artists do so why doesn't a nurse get remuneration every time you healthily get up in the morning, years after the nurse treated you? Or the construction worker, why does he or she not get paid a couple cents every time I use my house?
Not quite the same situation as when you're printing and selling role playing books with my art and making a direct profit from my work so I don't know how to answer this question.**
It's a good and perfectly valid question but that's a whole new topic you'd be opening there. It's a fact that payment across the professions is neither proportional nor fair in any way shape or form. And I have no answers for that, truly I don't but I'm not here to debate fairness of payment between the various professions.
***btw licensing images is not that expensive. And 99% of all artists don't sit at home lazily collecting royalties from previous work. It helps to add a bit of revenue and for starving artists any revenue is essential. Getting rich off royalties only applies to a select few artists.