The offers being thrown around by Facebook, Google, et al, aren't anything to scoff at, and as another poster pointed out already, have gone up substantially in a just a few short years (that 50% number is accurate for new grads, it's higher for those with experience).
But the bulk of programmers in the country don't work at Facebook, or Google, or Microsoft. Nor are they forging the bleeding edge future of consumer/enterprise tech. They're doing the unglamorous, not often discussed IT grunt work in the back office of some corporate headquarters.
Their salaries are stagnant, and they are stagnant regardless of H-1B numbers specifically because the supply-demand curve in that leve of the industry sucks. And because our statistics put the $45K VB6 coder in the same category as the $200K+ Google engineer, the rise in one segment of the industry is largely hidden.
There is a danger to making decisions based on averages.
It's strange to me how every time the tech immigration debate comes up Facebook, Google, Microsoft, and co. are beaten to a pulp. They're the ones actually importing people at above market rates, they're the ones handing out $110K offers to new grads and $150-200K offers to even intermediate level coders. They're not the boogeyman under your bed.
Whereas actual exploitative employers like Infosys are barely mentioned. In fact, none of the infamous programming sweatshops are even named in this article. How is that the actual bad actors are facing none of the media scrutiny while the only good (or neutral) actors get all the blame?