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P.s I was unclear if Glencore’s markup is actually 1000%, or whether they are just saying that 100% is reasonable and 1000% is excessive.
Ah. I see what you mean. Sounds like '1000% mark up' was maybe a throw-away figure from someone at ATO explaining it to the journalist?
Yes slightly unclear whether they know Glencore’s markup is 1000% or they are just explaining the ATO approach. @Stoorrrt may know more...
This set of accounts I found on the Internet gives you an idea of how, for another company in the industry, the marketing fee (based on % of gross sales) compares to the cost of that marketing.... http://www.smh.com.au/cqstatic/12z7v7/BHP%20Billiton%20Marketing%20AG%20AR$2014.pdf … This is fairly typical of the Marketing Hub issue.
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I’m confused 
Where do they get 100% (or 1000%?) markup figures from. Article says 4% discount on LME