heal thyself

this may be somewhat "unkind" to ask, but:

if oral roberts has the gift of healing, and benny hinn has the gift of healing, how come oral roberts had to have surgery to fix his broken hip from a recent fall at his southern california home?

i'm just wondering why benny didn't jump in his private jet, head over to oral's house and take care of his affliction. or does that kind of thing only happen at the mabee center in tulsa, during a previously scheduled "healing service?" it may be crass, but i don't think it's an ufair question.