Ron Natalie wrote in news:456d8f87$0$1618
:

INCORRECT. Rental has no bearing on the issue. The rules say
"carrying passengers for hire, or flight instruction when the
instructor provides the aircraft." If an instructor comes and
flies with me in MY aircraft, no 100 hour is required. If it comes
in his aircraft (or the club/fbo that employs him), the 100 hour
is requied.

This is an interesting point...

If both I and the CFI are club members, who is providing the aircraft - me or
the CFI? (Presumably, I'm paying for it that day.)

And if the club does not pay the CFI for his services (but the student
does)...

The wording would imply that this situation does not require 100 hour
service.