Like redbone3, I just finished relegating my SAE wrenches and sockets to bottom drawers and my secondary chest to make room for more Metrics. Besides old cars, tractors, OPE, plumbing, air hoses and tools, construction (I have a bunch of 3/4-10x6 nuts and bolts from a deck project), lug nuts, and any number of legacy fittings on modern stuff, I can't get rid of my SAE tools.
It kills me to see nice SAE wrench and socket sets going unsold or for cheap on ebay when I'm bidding twice as much for the equivalent Metric set, but that's why, everyone else is bidding on the Metric too. Sometimes I dream of replacing my old SAE tools with gleaming new wrenches and sockets on the cheap... but I have so much already, I can't justify spending another penny for SAE tools. Unless, of course, I buy an old car. Then it's game on!