It's inevitable that everything gets run through the wealthiest buyers first, but you should remember that new technologies do eventually become much cheaper. I don't see any real reason to be concerned that wealthy people will be playing with these things first: they get to find out first-hand what can go wrong, afterall, then force the manufacturers to work out those issues.
Said, no doubt, from a first-world country
Devil's advocate mode engaged!
A lot of cyberpunk is meant to be a reflection of modern problems, honestly - you have some cheap old iPods and the like trickling into West Africa, but it's still a terrible place despite how amazing our technology has become, not helped any by the fact that a lot of the minerals for it come from the lowest bidder, which is usually the one with the most wage-slave miners and manufacturers at their disposal in places that can't afford to care. So yeah, your new cyberarm is probably going to come from some armless kid in Ghana. Yes, even if it's 3D printed - the armless kid will just be mining. With his teeth.
At the same time, this is solved not at all by rejecting new technology. Businesses just wait until it's cheaper and keep making the old stuff, or drop prices further until people can't afford to resist, as enough people have it that it becomes crucial in some way to the market (smartphones). The world market very effectively feeds off of the psychology of the masses on every level. It's one big meat-grinder, and yes, I am full of cheer and sunshine today.
At the same time, I do think we've got the best chance yet to lift ourselves out of that in this era, by giving the lowest of the low disruptive technologies (particularly low-yield, lower-investment energy producing materials and facilities/education for cheap biotechnology far, far away from Monsanto's patent lawyers) that could make it less attractive to devote all resources to making widgets to trade. Then they could afford to make their own cyborg armies