Certainly! Compensation is orthogonal to the openness of a model.
Yes, but I used “royalty” for exactly that reason. If the use of copyrighted material in a closed, non-published model forces the model producer to compensate the author of the copyrighted material, then I can understand why copyright law makes the distinction between reproduction and distribution into a model, but if not, then I can see how this would benefit the science and arts.