Shawn Secretly Wealthy

I mean like insanely wealthy. Perhaps during his "missing years" he won the lottery or is getting royalties, someone he befriended left him money or some such. He donates anonymously to certain charities. He just uses Gus' credit cards because it pisses him off.

What sparked this was re-reading JW Grace's "Stranger Than Fiction" series http://psychfic.com/viewseries.php?seriesid=108