HOWEVER... AngelFlight West has specific requirements for renter
pilots. You must receive a checkout from the FBO by your FBOs CFI every
6 or 12 months (I don't recall which).

Not at AFSC. Every Angel Flight is a kingdom unto itself, and makes
its own rules. Some of them seem sensible on the surface, but really
they're all bad. Actually, once you get into the leadership structure,
the politics are hideous. I was once talked into serving as assistant
wing leader for a while - that lasted a few months and nearly soured me
on the whole concept.

I never understood why the
currency requirements are higher for renters but they are.

It's another of those rules that, on the surface sounds good but isn't.
The logic is simple - most renters are low time and don't fly much, so
they need recurrent training the most. Thus it makes sense to make
sure they get it. It's all very logical - and it's bull****.

Most owners don't fly much either (I believe the average personal
airplane flies 26 hours a year) and, because they can fly whenever they
want, are even more likely to wait for better weather than renters.
Also, many of them get pencilwhipped BFR's - I know several who have
been getting their BFR's in a bar rather than an airplane for decades.
The difference is that renters are used to rules and bull****, and
owners feel they shouldn't have to deal with rules and bull****. Thus
extra rules for renters.

Michael