Now, this is a US poll, not a world-wide poll...But it says that only 10-15% of people are left-handed. That leaves 85-90% right-handed.
It would be hard to justify tooling, CAD time, R&D, and trial and error for a company to justify making left-handed guns for 15% of it's clientel.
Granted, Remington has made left-handed 700's for quite a while now, so I do agree that they could have sold several more Senderos if they were offered in left handed as well.
I have several friends who hunt and shoot and they are dominantly left-handed, BUT they do almost everything right-handed. They shoot right-handed guns, and shoot them in right-handed form. Shoot right-handed bows. They do everything right-handed, except write.
But, like I said before, the overhead for manufacturing something simply to appease 15% of your clientel is hard to justify.
So, I can understand why Remington didn't make every model rifle in a left-handed configuration...There would still be dealers with left-handed 700's sitting on the shelves and stocked up in the stock room from 10 years ago.
Left-Handed Shooters and Left-Handed Guns | Field & Stream