That is a wild guess, and wildly inaccurate. As I've said, I've been visiting Prestwick Aviation for 17 years and those folks are on the up and up. Contract fuel prices are set. Lodging and perdiem rates are set. The Turnberry was only offered when it was the only accommodation available. Do you know of an alternative airport that meets all the requirements of transiting military aircraft, crew, and pax with fuel prices 50 cents less? I challenge you to find it. There's quite a bit more to RON planning than the price of fuel. If you've ever been deployed and are looking to save $25K of taxpayer money in Scotland, you're looking in the wrong place.
If an FBO/hotel provides a great experience while conducting business within the government rules and government rates, how is that a hustle? That's just good business. This is no Fat Leonard, just another instance of politicians throwing shit against the White House walls hoping something sticks.