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There’s a few factors.
How thick is the plasterboard. 12.5mm obviously will take more than 8. If you can hit a stud or two it will help a lot. Although with vertical fixings, I guess you either will or you won’t hit a stud.
The type of plasterboard fixing and how well you install it also makes a big difference.Because the rails are vertical, that should help distribute the load downwards on to the fixings better than normal/shorter shelf brackets.
Be aware that heavily laden shelves may hold onto the wall, but crack the wall elsewhere. As the shelves will stay attached, but start pulling the plasterboard off the studs!
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We hang radiators on walls very regularly using toggle fixings, as said below if you can hit a stud that would be class but if not toggle fixings is the way to Go.
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I've got a lot of 606 with significant weight on lath and plaster which is much worse than plasterboard. The fixings they provide are great and you're right about the number of fixings on the rail spreading the load. I have a problem with one area where there's a desk, extra leverage of course.
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How much load can an average plasterboard wall take?
The lifetime guaranteed safety answer is zero load. And that's what I would stick to if I were you.
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@Howard
How much load can an average plasterboard wall take?
Thinking about putting some 606 shelving in upstairs but the wall is single skin plasterboard. Vitsœ say this is OK, presumably because each rail has about eight mounting points so the load is fairly well distributed.
I'm not going to do a whole 'wall of books' type thing but there will be a bunch of files, a tv, consoles, paperwork etc.
How concerned should I be about it pulling out of the board?