I'm not the CPA, my husband is. I don't work for the IRS but our next door neighbors do (imagine our chit chat's over the fence

). None of us are tax attorneys but we've met a couple over the years. All of this then needs the disclaimer that I was simply trying to offer a general Joe's explanation to the reasons why Apple may have made certain choices along the way, whoever first mentioned it deserves kudos as it seems to me to be quite logical.
SOx applies to those who answer to the SEC. The date of transaction is irrelevant and the car dealership doesn't quite fit the argument - but I hear what you're saying.
I agree that the IRS should have no right to determine a value for anything - regardless I am limited to the value I can claim for each sweater I donate.
Any non-tangible (like a download) could be used by evil bean counters to hide income from the gov't or losses from investors. The investigation alone is costly, whether they are guilty is irrelevant. All associated expenses factor into my next purchase.
So, if Apple gives me $100 or a free printer under the strictest observance of tax code I should claim that as income. The fact that most folks have no clue that could be considered income doesn't change the code. The gov't would pay more to audit than they would glean in tax from me. But I received $100 that should have been taxed somewhere. Every dollar matters when we flush it faster than we can print it.
If I ran compliance in Apple's tax dept I wouldn't have time to explain something that most people don't notice, others don't comprehend, and the rest declare a conspiracy. If I owned stock I would be pleased with my perspective of their logic.
All sides of this are speculation. Maybe they do just want to make more money. I choose to sponsor Steve's effort to take over the world! Beats the heck out of the rest of our choices right now.