The rise of thinktanks in America is to a certain extent a function of the nation’s tax laws – rich people can avoid taxes by setting up socalled ‘nonprofits’ and donating money to them.
Certainly it is one of the ‘best’ – i.e. most effective – commodities in the political market place. All governments trade in this currency to a greater or lesser extent, and will no doubt continue to do so for the foreseeable future.