Not the most welcoming response but I can appreciate the honesty, so thank you.
Removing 5 bolts every 3 to 4 months is not that big of a deal. There are tons of skid plates on the market that are solid and for good reason - mainly it is easy to get something (i.e. stick or rock) jammed up in a hole which can do quite a bit of damage. I understand the naturally response to that would be to sat the damage wouldn't be as bad as "cooking your oil", but that simply hasn't been what I (and others) have observed. I haven't seen any changes in my oil temperatures and neither has anyone else with this set up or other skid plates without vents for that matter (that I know of and/or asked).
Since we're being honest here, vents and oil changing holes are simply cosmetic. They introduce weaknesses into the material/surface which essentially reduces the effectiveness of the skid plate to a greater extent than there is an inconvenience in removing it for an oil change.
Thanks for the reply, I do appreciate the honesty.
On a more positive note, the bar itself is serves many purposes. The front hoop obviously provides mounting (x4) tabs for lights and anchors the top hoop which offers 4 mount light mounting tabs - eight total. Just behind the base of the bumper the cross tube stiffens the front subframe and protects the bottom of the radiator shroud - which many folks realize is one of the weakest points on these cars. Straight back from there is a tube running to the center jack plate. It bisects the oil pan, providing direct protection for it while not getting in the way of the drain plug. The rear most cross tube fastens to the jack plate using factory threaded holes. The entire piece stiffens the frame resulting in better handling.
We've had a lot of positive feedback from the owners of the bar so I am very pleased with it's success. But, as I mentioned in my original post, I'm interested in hearing from Legacy/Outback/Baja owners here to see if there is any interest for a similar product.
Thanks again for your replies. I look forward to more input.