Can only speak for my side of the pond, but two years ago nobody used Leupolds or Zeiss. Several do now, but not one of them paid for their scopes. That being said, it gave me a chance to look through both and they are both very nice. If not for the sponsorships, the Zeiss would not even be on my radar. One of our top shooters has in a few years gone from Kahles to ZCO and now Leupold. I honestly doubt any of the three will cost him points over the other, it sure does not seem like it. Have not asked him about it though.
Ya, it won't cost them any points. Leupold and Vortex will be the companies that can and will give out free optics. Much more so than most any other company. And if they hindered the performance, shooters still wouldn't use them if they couldn't win with them.