No. 5: Questcor Pharmaceuticals Steeply priced drugs sold to a very small number of patients and reimbursed by insurers equal big profits for drug companies like Questcor ( QCOR). Acthar Gel, which Questcor sells for more than $23,000 per vial, is used to treat a rare form of epilepsy that strikes a couple of thousand babies each year. The stock: Questcor's stock price is up 195% this year through Dec. 2 because biotech and drug investors love growth. Questcor's earnings are expected to increase 55% this year and 47% in 2011.