Resimac is a non-bank that aims to be more competitive than the banks. It does this by having no branches and less staff. It sources its funds from the wholesale market. Hence, although its rates are competitive, they are also subject to higher volatility. Resimac make its money by packaging many loans and selling them to the wholesale market for a profit. Hence, it makes its money from you after a few months as opposed to over the life of your loan. Its services should be considered as a one-off transaction as opposed to one that will foster an on-going relationship.