I don't know for sure, because I have no real data. But that doesn't stop lots of people from speculating.
Take Reason senior editor Brian Doherty in Why Ayn Rand is Hot Again :
"Readers and pundits alike look at America and see a world scarily reminiscent of Rand's government-choked dystopia in Atlas. It's a world with a struggling economy where political pull matters more than success in the free market, where the government blithely takes over huge transportation industries."
His claim about readers and pundits might be absolutely true. But somehow he doesn't point out that the readers and pundits he's discussing are idiots. Because the real world is NOT like the conspiracy plot of Atlas Shrugged. If government "looters" WANTED to take over transportation industries, it would take over the most profitable ones. Not the losers. Likewise the banking industry. Did government take over the profitable rail freight industry? No. It took over the unprofitable passenger rail industry. Did government take over the profitable foreign-owned auto industry? No, it took over our failing domestic auto industry.
The right-wing echo chamber is full of stupid assertions that the economy is behaving as in Atlas Shrugged. They're patently false, but ought to pump the sales up as a side effect.
Another factor that would push up sales of AS are the Twin Biographies of a Singular Woman, Ayn Rand. I don't think the publicity of these two biographies is nearly as effective as the right-wing echo chamber, because the media are saturated with the latter.
A third possibility is that sales to Asia have increased. With around 3 billion people in India, China, Pakistan, Malaysia and Indonesia, one thousandth of a percent would be 30,000 sales.
Of course, book sales are a bad measure of how many readers a book actually has. Atlas Shrugged is such a miserable read that I suspect most people don't finish more than a small fraction of it.
The libertarian movement crested around 10 years ago, and has been conspicuously declining ever since (judging from the collapse of the US libertarian party.) Its strongest economic claims have been usurped by neoliberal corporatists who want economic liberty for corporations, and the hell with real people. They're already very powerful (plutocrats have always been powerful), and Rand is just more grist for their continuous propaganda efforts. A bump in the sales of AS is nothing I worry about: all it signals is that AS is a talking point for this month.