Yes, we get it: You've got a measly "pile" of whites that consists of a tank top, a button-down, and a pair of denim jeans. As much as you might think it best to set these aside until you've gotten a few more pieces to add to the pile, it's not.
The longer you let those clothes sit before laundering, the more time once-invisible stains have to set. If you wait a month to wash that white button-down, for instance, by the time you throw it in the washing machine, it has very likely acquired yellow stains under the armpits from perspiration and deodorant that have taken hold of the fabric.
White-Hot Tip: Wash white pieces after every wear, even if they still look clean. We're all for rewearing jeans and sweaters, but your whites should be the exception.