[TowerTalk] Station Ground

[N6KJ]

OK, I've gotten several responses to my station
ground question.  Nearly all of them have described
a ground system with "beefy" (#0 or #2 stranded)
wire connecting a bus-bar in the shack to a
ground rod (or multiple ground rods connected
together), but all of them have described how they
connect the rig to the bus-bar using much smaller
(like #10) wire.  Isn't this a "weakest link problem"?
Why do you need "beefy" connections from bus-bar
to ground when you use much smaller wire
connecting the equipment to the bus-bar?