I don't blame Rockstar. I blame our union for not having the agreements in place to protect the creative people who drive the sales of these games. Yes, the technology is important, but it's the human performances within them that people really connect to, and I hope actors will get more respect for the work they do within those technologies.
As far as we know, Hollick only voiced Niko for one game. Main character or not, it was only for one job. Now if he was providing the voice of the main character of very popular TV series that will spawn a few movies and videogames, then I might see him getting royalties.
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