Scepticism as a philosophy is not sustainable; as an attitude towards life/knowledge it's the only way not to get tangled up in own contradictions. And yes, it does hide its own values, principally the assumption that you can reach the truth with reason. (It still remains a good enough method, though.)
"The Devil is not the Prince of Matter; the Devil is the arrogance of the spirit, faith without smile, truth that is never seized by doubt. The Devil is grim because he knows where he is going, and, in moving, he always returns whence he came."