see the few answers I found to my own questions:

 

http://www.ultimatesubaru.org/forum/showthread.php?t=34684

Liability. For "re-fixing" your car in case of a screw-up that they need to correct. Read the posts on this board about cars that were improperly repaired at dealerships, that resulted in more damage that it went in with! I hate to say it, but the majority of the "mechanics" that work at dealerships are just parts-changers. Period. "Training/certification costs" is present in a utopian world only. I woud LOVE to pay the prices charged for a properly trained "mechanic" that has insight beyond a computer output.

 

Here Here! Our Subaru rebuilt engine just melted after 5 months, but my Dealer does not feel liable to actually provide warranty as promised.