Why do some manufacturers reverse preamp polarity in the first place?


My Rogue RP-5 reverses polarity, so I switch the pos / neg at speaker terminals. The manual does not mention this, however, I wrote the company and they the amp does reverse the polarity. 

Now my question is...why? I would say 98% of buyers of this amp do not know to reverse the cable connections. I would say most reviewers did not as well. Yes, I realize, polarity reversal is not noticable in most instances. Especially, since many recordings are all over the place when it comes to polarity (at least that is what I've read).

So the question remains...why...why not just have the amp terminals set up so the buyer can just plug in as normal?
aberyclark
Be that as it may, you didn’t present any evidence, either. It’s what you choose to believe. Nothing more. Making jokes behind someone’s back is not evidence the person is wrong, actually. I find your anecdote unconvincing.
Ralph, +1, for a great story!

Geoff, -1, for missing the point about what constitutes a refutation argument (it’s not the jokes, it’s the behavior of the guy running out of the room after getting his butt kicked in a demo). 

Celander, I didn’t know you had a dog in this fight. Be that as it may I see you don’t have any evidence, either. Oh, well, I didn’t really expect any. No biggie. So, what is it, 50% or 92%, hot shot? Guess we’ll never know. 
Geoff, -1 for claiming one has to have a dog in the fight to comment about the obvious. Since when did you ever have “a dog in the fight” to justify the vast majority of your 14,000+ posts?