um, yes, thats what happened to quite a few lenders during the financial crisis, and those lenders that bought the mortgages decided to have their book 'run off'. In effect this meant no new loans or variations, higher interest rates. most of the clients refinances, the unlucky ones got stuck.
With your seasonal income, Id say you might be a candidate for being stuck if anything like that happens again.
Id suggest either one of the big four, or one of their subsidaries. if your really rate focussed, perhaps Ubank might be a lesser risk?
Thanks tobe, will have a look at Ubank. Pretty much rate driven at the moment unless the rates are only marginally different.