Why is that? I mean really, why? Cut that crap down to the guys on the tail end of their careers and what, one dude? Seriously who cares that much about ex presidents? Now osama fucked things up so bad I could see someone with an ax to grind there. It's wasted money bro. Plain and simple.
Protect them yes but at what cost? How many agents? Especially since no one cares. Has there ever been a foiled assassination of an ex president? Didn't think so
You think the Secret Service protection they receive might have something to do with that? In your case, probably not.
Do you think we would have heard about it if there were? I damn sure know we would because the gvt loves to toot their own horn. I couldn't think of a more boring job for a SS Agent