Mainly it will help encourage more domestic oil production, instead of those jobs going elsewhere.
Again, only if we produce more domestically then we consume (and net imports are zero). Otherwise, if our wells are pumping at 100% anyway, we're already getting the full benefit.
Naturally there are other economies we could take advantage of if the ban were repealed, as in a case where it might be cheaper to export from the west coast while we import the same amount to the east coast. These kinds of decisions should be left to the market - not the government.