No you have missed the point!
Many, if not most from the feedback I get from them, pay the course fees as a "Citizenship" fee. Once they have competed their course (or before even in some cases) they start the process to become Australian citizens.
One group I know of sponsors current uni students as 'scarce workers' aka 457 so they get the citizenship before they have even completed their degrees in some cases.
An Australian citizenship & passport is considered a VERY valuable commodity in many countries - especially in China and the feedback is Australia 'sells' it for much less than either the US or Canada does.
It got to the stage in 1990 that the countries taking advantage of this rort had become a large enough proportion of voters in 8 Federal seats that neither side was willing to close the rort down. How do I know - it is amazing what people will discuss after their second bottle of red at lunch.
Snouts in trough drive the decisions and keeping 'your party' in power and on the receiving end of the over $500,000 per week 'declared' donations drives the governing of Australia and every state unfortunately.