So basically you end up with the same thing at a higher cost.
I contacted one dealer that offers their tune (1 revision included) with the AP - it was $75 more than the cheapest price I got for just the AccessPort. He said they do sell their base tune on it's own, but it's $150, which means the cheap AP and the tune would be $75 more than buying the AP from them with their tune on it. For another $50 ($125 more than for just the cheap AP), I could get a custom tune on 91/93.
When I had my '09 WRX, I ran an of the shelf tune from a vendor that was $75 - there are more vendors doing it for the WRX, so the prices are much lower it seems - and it was a nice upgrade from the standard Cobb canned tune. I'm probably not going to mod my FiST that much more than a tune, so I'd want the base tune from a vendor.