Really? Honest question.
For junior or mid level SE I've seen about 10% of candidates meet the hiring bar. SDEs I've had less involvement, but I'd hazard 20% get an offer where I've been.
The other problem is the pipeline. Colleges keep Pumping out SDE candidates from comp sci and maths. These junior SDEs will also have a reasonably consistent skill set and experience. There are (effectively) no colleges or curriculum creating new SEs. The incoming candidates also vary widely in their depth and breadth of relevant knowledge. Pretty sure that contributes to the higher negative signal.
Linux and BSD are hellaciously complex and prone to very strange behavior once you start taking them into high-performance land.
If you're OK settling with, "can read syslog and look stuff up on the web", those guys are cheap.
Being a good Linux sysadmin might be fundamentally harder than being a good EC2 sysadmin; I'm not honestly familiar enough with EC2 to know.
I would point out though that Amazon has a vested interest in making EC2 less hard, so I would be surprised if the general opinion was that EC2 administration was just as hard as Linux administration.
But looking at general rates, I would say no.