The road so far...
These are things we have found thus far that work with a relatively high degree of confidence. Nothing in life is guaranteed, but these are excellent in theory and have been put in practice without catching on fire.
Also, we don't have 42 solutions yet.
4 Year Loans
Most people have debt and are only paying off interest at more than 7% APR. Some people have money that they're looking to invest long term hoping for at least 5% APR return on investment. Why not combine the two?