This is finally fixed in Xcode 7.
https://developer.apple.com/library/prerelease/ios/documenta...
Another option would be to make a Hackintosh, actually; if you have a sufficiently powerful spare machine; this would also need the OS software, so virtualizing is probably just as easy.
I bet if you looked at winning hacks the Android skew would be much less defined (as winning hacks are usually developed by people who learn outside of class and have prior experience with the platform).
78% of the current smartphone market is Android, 18% is iOS. [1] (4.3:1 in favor of Android)
According to the article, 38% of hackathon devs are interested in Android dev, and 22% are interested in iOS Dev. (1.72:1 in favor of Android)
From this perspective, desire to develop for iOS is MUCH higher than market representation, meaning that (as I read the numbers) comparatively, Android appears to be the weaker choice -- and that amongst hackathon developers, iOS is far over-represented compared to the market as a whole, as I assume most at these events use their own devices.
[1] http://www.idc.com/prodserv/smartphone-os-market-share.jsp