while the idea has merits, i would not trust you with my most sensitive data (especially if it is reversibly encrypted or plaintext), i would feel like i was paying for an added secuirty risk, of which there are too many already. also it doesnt seem like there are assurances against you abusing my data like there would be if you were a lawyer i had entrusted to execute my will. there's no personal relationship there, so i don't feel comfortable.