I know im a little late on this but....
As you see, most of Europe & all of the America's wouldnt bother turning up for week 2, 4.....
10utc is between 4am & 7am in the states IIRC
If you looked at the license pie chart, Europe probably accounts for 60-75% of them. In terms of nations, Europe will account for probably more than half of the competing teams.
Lets be honest, if it wasnt being organised by Aussies, then you wouldnt get a bloody look in in regards to what time it started. Im not saying thats right/fair but its true, everyone would be told the races start at XXutc, who's up for it. Because its Aussie based, and your on the other side of the planet from the majority of people you want to compete against, your kinda forced into catering for everyone because otherwise nobody would turn up because its inconvenient.
I'll say it again, cos people will ignore it, im not saying any of thats fair, but lets be honest it is the reality of it. Nobody will stop the series taking place at an inconvenient time for the majority, but only those its convenient to will be taking part.
If its inconvenient for Europe, you lose over half your entrants, the Americas you'd lose 1/4, the Oceana region another 1/4 and then middle east & remaining areas probably wont have anyone or not enough to cater towards.
Also, dont forget that a 20utc start is Saturday night in Europe, its 8pm-10 to 10pm-midnight depending where you are, so European entrants would be giving up their Saturday nights, its not exactly perfect for Europe either.