"It's utterly ridiculous that the U.S. taxpayer is funding these searches"
No it's not - it's called Search and Rescue and it is a cornerstone of civilization. You know, the help thy neighbor thing, bringing aid to your fellow man in need and such.
The fact that Fosset was a millionaire does not enter the equation, searches have been conducted in this manner before for entirely unknown people, independant of whatever monetary wealth they might have had at the time.
The fact that search time is being respected is the best way to respect people's tax money. He had his chance, it didn't pay off, they stop.
There's nothing to rant about here.