A good pair of socks can last for years if you treat it well. The best socks, premium socks, and luxury socks are not disposable. They deserve a little care.
First, read the label. Cotton socks and wool socks need different temperatures. Hot water can shrink wool and break down elastic. Cold water is almost always safer. Second, turn them inside out before washing. Third, avoid the dryer if you can. Heat is the enemy of stretch. Designer socks and thin socks can lose shape quickly. Fourth, do not walk around in socks on rough floors. Cushioned socks can handle it for a while, but the heel and toe will wear faster.
If you buy socks on sale, check the quality first. A well-made pair will outlast three cheap ones.