If you are comparing Apolla Shocks to a pair of regular socks, then yes, they are expensive. However…

Shocks aren't Socks

Shocks are uniquely designed compression footwear, made especially for dancers using anatomy, kinesiology and sports-technology. They last a long time and offer the kind of protection that a high-quality dance shoe does. If you compare the price of Apolla Shocks to high-quality (non-dance) sports compression socks, then the prices are comparable.

If you want to dance with no shoes and still get the protection of quality dance footwear to protect your feet, ankles and knees, then the price of Shocks doesn't seem like much at all.