You're missing the point here. Try again.
No point missed. Video game voice actors are paid extremely well for their work, unlike movie stars who have a name to themselves, let alone movies are dependent on actors to actually be made, while video games are dependent on developers, artists, and coders more than actual voice actors.
A lot of the workers who actually work on making video games at big publishers normally don't get paid as well unless they're in higher management, they're pay is very low mostly because of many people are trying to get into the field.
What these voice actors probably don't know is that voicing for video games is in huge demand by actors themselves because they pay extremely well. So if they're argument is that game companies are making millions they should be paid more to compensate, even though they're pay is extraordinary well? I simply don't agree, hell go on strike I'll take your job instead.
Long story short this strike won't be effective because there's more actors that are willing to take the role, and the pay they want doesn't warrant the demand nor the work their putting in. Give the money to the people who get paid less and who's work actually warrants the pay raise.
Do these people expect to get higher compensation than the average programmer/artist on the game?
Voice actors are typically paid by contract unless their voice work is required on a regular basis, in these instances it's not rare for a contract with a huge sign on bonus with a hourly rate, very rare though.
Their contracts are just until their work is completed, and sometimes includes additional dialogue for trailers or game promotion.
But the short amount of time they work they get paid equal or well more to what most programmers/artists make on a game. Granted once their work is done they have to find more work, that's the conundrum with voice actors. They get paid EXTREMELY well, but they have to keep finding work, and could go weeks without finding anything but that's mostly because most voice acting work is a highly desirable job by actors because of it's large pay.