why do you say super greedy? property investing is a business.
there is a high demand and low supply = higher prices (think petrol, food, utilities etc). the market sets the market rate. if someone else comes along and is prepared to pay $75/wk more for the property than your friend, why should the landlord subsidise your friend at the cost to his own pocket?
if no one is prepared to pay the extra $75/wk, then yes, it is over market and the landlord will have to drop the price. if someone is prepared to pay, than the price is "market value".
landlords have also had to put up with 12 rate rises over the last few years without being able to put up their rents. so mortgage interest repayments have practically doubled over the last 5 years or so - have rents also doubled in that time?
yields are currently around 5% of the property value (on average - sometimes more, sometimes less) - so your friend is paying less to live in the house than if she bought it and was paying 9% interest on her loan. so is she better off financially renting the property or buying it?
i don't really know the ins and outs because i leave that all up to my property manger, but i believe your friend can claim that the increase is too high. however, if she is off lease than the landlord has full right to not renew and force her to leave.
for the last 10 years it's been a renters market - now it is time for the landlords.