I find it amusing that you dismissed this in a sibling comment as “just comparing spending to returns”… that’s literally what lobbying is: spending money to secure political favor. If our elected representatives simply agree that something should be a priority, companies wouldn’t need to bribe them to do it.
(Not so clear, personally, how you justify transposing this semiconductor handout to the more superficially defensible “national security”; but see also fossil fuel subsidies, corporate tax breaks, barring negotiated drug pricing: https://visual.ly/community/Infographics/politics/amazing-ro... )
As for “why is it so cheap”? I always assumed it was at least in part because there are a limited number of politicians competing with each other for the same funding sources.
It’s very low effort for a corporation to threaten to offshore and ask for a handout to not follow through on the threat. And it’s a very easy call for the politician to take the bribe, because then they can go back their constituency and say “We saved your jobs from going to China!” Everybody wins except the taxpayers. (And the corporations will go ahead and offshore, or not, just like they would have anyway, because one of the services they pay their lobbyists for is ensuring there will be no consequences for accepting the handout.)