Yeah i would agree with that Briefing charge crap...
$70/hour for each hour of briefing isnt too bad, but when you are adding up 27.5 hours briefing for your GFPT, 20.5 for your PPL, 11 for your NVFR, 27.5 for your CPL for a grand total of 86.5 hours of briefing (a cost of just over $6000) it becomes clear that this is daylight robbery.
Why is it that people expect a professional to give ground training for free? Does a lawyer only charge for they time they actually go to court?