$6/400k is like a medium sized agency monthly budget. It's not something you learn to manage in 1 or 2 days training.
You never scale a campaign to that level until you've done weeks if not months of testing and fine tuning with every possible ad's creatives and demographic audience. Starting at $100k/days means whatever goes wrong it's already too late to fix it ... you don't have the time to do any serious testing and optimization.
Moreove it's not that easy to spend $100k/day in canada ... I deal with many Startups and Brands that get Facebook Ads right and their usual problem is they've found the right mix ads/audience to have a very good ROI but they cannot scale it to spend those amounts.
Spending $100k per days probably means that he was targeting the whole canada. Whitout any specific targeting on interests, demographic informations etc. If that's the case and he was getting 150k clicks per day out of a $100k budget he should be pretty happy :)
Facebook is not perfect ... and click fraud is a huge problem. This does not means that Fb Ads does not work or return a negative ROI. You simply need to know the medium you are advertising on and use it wisely.
Thanks god we live in 2014 ... we can track everything ... real things like sales, leads, subscriptions. WHY people keep advertising to go after vanity metrics such as Number of likes or clicks. Who cares about the clicks.
Part of them are fake? Sure! Facebook should do more? Sure! Can you still earn money tracking you Facebook Ads overall Cost per sale instead of the cpc? Damn sure!